Missouri: Alcohol and drugs
How alcohol and drugs affect driving, Missouri’s alcohol limits, implied consent, DWI penalties, Abuse and Lose and minor-in-possession rules. Split into 4 shorter tests so you're not stuck in one long quiz.
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Alcohol and drugs — Part 1
Questions in this part include: “Which of these can cause your license to be revoked, suspended, or denied?”
StartAlcohol and drugs — Part 2
Questions in this part include: “For an administrative action, what is the result of a second offense within a 5-year period?”
StartAlcohol and drugs — Part 3
Questions in this part include: “What is the driver license suspension for a first Minor in Possession (MIP) offense?”
StartAlcohol and drugs — Part 4
Questions in this part include: “At what BAC is it illegal for an adult driver who is 21 or older and not driving a commercial vehicle to drive?”
StartAll 79 Alcohol and drugs questions with answers
Choose a part above to take a practice test, or study every question and answer here.
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Which of these can cause your license to be revoked, suspended, or denied?
- Renewing your license before it expires
- Driving under the influence of alcohol or drugs
- Requesting a duplicate license at a license office
- Updating your mailing address on your driver record
Show answer
Correct answer: Driving under the influence of alcohol or drugs
Driving under the influence of alcohol or drugs is listed as a reason you can lose your license.
Source: Missouri Driver Guide (Revised August 2026), page 14 · Open this page in the manual (Manual page 14)
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You can lose your license if you do which of these?
- Request a DHH notation to be placed on your license
- Register to vote when you apply for a license
- Refuse to let a police officer test you for alcohol or drugs
- Ask a clerk to add a medical alert notation
Show answer
Correct answer: Refuse to let a police officer test you for alcohol or drugs
Refusing to let a police officer test you for alcohol or drugs is a listed reason for losing your license.
Source: Missouri Driver Guide (Revised August 2026), page 14 · Open this page in the manual (Manual page 14)
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Which of these actions involving alcohol can cost you your license?
- Showing your own valid license to a clerk when you buy alcohol legally
- Carrying your own valid license into a store that sells alcohol products
- Letting a clerk scan your own valid license when you pay for a purchase
- Changing your license information or using another person's license to buy alcohol
Show answer
Correct answer: Changing your license information or using another person's license to buy alcohol
Changing the information on your license, or using someone else's license, when you attempt to buy alcohol is a listed reason for losing your license.
Source: Missouri Driver Guide (Revised August 2026), page 15 · Open this page in the manual (Manual page 15)
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Which of these can cost you your license?
- Failing to wear a medical alert bracelet
- Failing to carry a boater safety card when driving
- Failing to ask for the optional organ donor symbol
- Failing to use an ignition interlock device when required
Show answer
Correct answer: Failing to use an ignition interlock device when required
Failing to use an ignition interlock device when required is a listed reason for losing your license.
Source: Missouri Driver Guide (Revised August 2026), page 15 · Open this page in the manual (Manual page 15)
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If you are a minor, which of these can cost you your license?
- Riding in a vehicle with a parent who drinks coffee
- Possessing any intoxicating liquor
- Standing near people who are not wearing seat belts
- Living in a household with a person who has a liquor license
Show answer
Correct answer: Possessing any intoxicating liquor
Possessing any intoxicating liquor if you are a minor is a listed reason for losing your license.
Source: Missouri Driver Guide (Revised August 2026), page 15 · Open this page in the manual (Manual page 15)
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To obtain an intermediate license, how long must you have had no alcohol-related convictions?
- The last 30 days
- The last six months
- The last two years
- The last 12 months
Show answer
Correct answer: The last 12 months
Getting an intermediate license includes having no alcohol-related convictions in the last 12 months.
Source: Missouri Driver Guide (Revised August 2026), page 16 · Open this page in the manual (Manual page 16)
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If you believe you have seen a drunk driver, what should you do?
- Follow the driver until he or she stops
- Flash your headlights at the driver
- Wait until you reach your destination to report it
- Tell the police immediately
Show answer
Correct answer: Tell the police immediately
The manual says to tell the police immediately, since you may be saving someone's life.
Source: Missouri Driver Guide (Revised August 2026), page 34 · Open this page in the manual (Manual page 34)
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Which is helpful information to give the police about a drunk driver?
- The license plate number of the vehicle
- The driver's name and date of birth
- The driver's age and occupation
- The driver's home address and phone number
Show answer
Correct answer: The license plate number of the vehicle
The manual says helpful information includes the license plate number, a physical description of the car and driver, and the vehicle's location.
Source: Missouri Driver Guide (Revised August 2026), page 34 · Open this page in the manual (Manual page 34)
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What does the manual tell you about driving when you feel tired?
- Do not drive if you feel tired
- Drive only on roads you know well
- Drive more slowly and keep going until you arrive
- Switch to high beams to stay alert
Show answer
Correct answer: Do not drive if you feel tired
The manual says to stay awake and alert and not to drive if you feel tired.
Source: Missouri Driver Guide (Revised August 2026), page 62 · Open this page in the manual (Manual page 62)
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If you injure or kill someone because you were drinking or using drugs while driving, how much jail time may you face?
- Two to seven years
- Up to 30 days
- Up to 90 days
- Ten to fifteen years
Show answer
Correct answer: Two to seven years
A driver who injures or kills someone while drinking or using drugs may spend two to seven years in jail.
Source: Missouri Driver Guide (Revised August 2026), page 67 · Open this page in the manual (Manual page 67)
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If you injure or kill someone because you were drinking or using drugs while driving, for how long may you lose your driver license?
- Six months
- Two years
- Five years
- Three years
Show answer
Correct answer: Five years
Besides jail and a fine, a driver who injures or kills someone while drinking or using drugs may lose the driver license for five years.
Source: Missouri Driver Guide (Revised August 2026), page 67 · Open this page in the manual (Manual page 67)
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If you injure or kill someone because you were drinking or using drugs while driving, what fine may you have to pay?
- $2,500
- $5,000
- $10,000
- $15,000
Show answer
Correct answer: $5,000
The penalty for injuring or killing someone while drinking or using drugs while driving may include a $5,000 fine.
Source: Missouri Driver Guide (Revised August 2026), page 67 · Open this page in the manual (Manual page 67)
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Why might a police officer ask you to walk heel to toe or stand on one leg after stopping you?
- To decide whether your vehicle needs a safety inspection
- To decide whether you must attend a hearing at once
- To decide whether your license should be renewed early
- To help decide on an arrest and a chemical test
Show answer
Correct answer: To help decide on an arrest and a chemical test
The officer uses such tests to help decide if the driver should be arrested and have a chemical test of breath, blood, or urine.
Source: Missouri Driver Guide (Revised August 2026), page 67 · Open this page in the manual (Manual page 67)
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What is the result of a chemical test of your breath, blood, or urine called?
- Your Driver Alcohol Rating level
- Your Blood Alcohol Content (BAC) level
- Your Substance Awareness test score
- Your Intoxication Point level
Show answer
Correct answer: Your Blood Alcohol Content (BAC) level
The result of the chemical test is known as the Blood Alcohol Content (BAC) level.
Source: Missouri Driver Guide (Revised August 2026), page 67 · Open this page in the manual (Manual page 67)
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After an officer takes your license because of a BAC at or above the limit and gives you a notice, after how many days will your license be suspended or revoked?
- 7 days
- 30 days
- 60 days
- 15 days
Show answer
Correct answer: 15 days
The notice tells the driver that the license will be suspended or revoked, and the driver cannot legally drive, after 15 days.
Source: Missouri Driver Guide (Revised August 2026), page 67 · Open this page in the manual (Manual page 67)
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What does the notice an officer gives after taking your license include, if the officer indicates this on the notice?
- A 15-day driving permit
- A 7-day driving permit
- A 30-day driving permit
- A 45-day driving permit
Show answer
Correct answer: A 15-day driving permit
The notice includes a 15-day driving permit that the driver can use if the officer indicates this on the notice.
Source: Missouri Driver Guide (Revised August 2026), page 67 · Open this page in the manual (Manual page 67)
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After an officer takes your license for a BAC at or above the limit, what immediate privilege may you request on the notice if you are eligible?
- A 30-day Restricted Driving Privilege
- A 15-day extension of your full license
- A 90-day Restricted Driving Privilege
- A one-year Restricted Driving Privilege
Show answer
Correct answer: A 90-day Restricted Driving Privilege
The notice allows a driver, if eligible, to request an immediate 90-day Restricted Driving Privilege (RDP).
Source: Missouri Driver Guide (Revised August 2026), page 67 · Open this page in the manual (Manual page 67)
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If you are given a hearing after an officer takes your license, until when may you continue to legally drive?
- Until 15 days after a decision is mailed to you
- Only until the date of the hearing
- Until 30 days after the hearing takes place
- Until the day a decision is mailed to you
Show answer
Correct answer: Until 15 days after a decision is mailed to you
A driver who is given a hearing may continue to legally drive until 15 days after a decision is mailed.
Source: Missouri Driver Guide (Revised August 2026), page 67 · Open this page in the manual (Manual page 67)
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What two types of actions may be taken against you for driving when you are not fit to drive?
- Civil actions and criminal actions
- Warning actions and arrest actions
- Administrative actions and court convicted actions
- Insurance actions and registration actions
Show answer
Correct answer: Administrative actions and court convicted actions
The guide says there are administrative actions and court convicted actions, which carry different penalties.
Source: Missouri Driver Guide (Revised August 2026), page 67 · Open this page in the manual (Manual page 67)
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How are you notified of when you must stop driving after a court conviction for DWI or a BAC of .08% or more?
- By a call from the Highway Patrol
- By a notice from the judge in the courtroom
- By an e-mail from the insurance company
- By mail
Show answer
Correct answer: By mail
You will be notified by mail when you must stop driving.
Source: Missouri Driver Guide (Revised August 2026), page 68 · Open this page in the manual (Manual page 68)
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For an administrative action, what is the result of a second offense within a 5-year period?
- Six-month license revocation
- One-year license revocation
- Two-year license revocation
- 30-day license suspension
Show answer
Correct answer: One-year license revocation
Administrative actions include a one-year license revocation for a second offense within a 5-year period.
Source: Missouri Driver Guide (Revised August 2026), page 68 · Open this page in the manual (Manual page 68)
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For a first court-convicted offense of driving with a .08% BAC or more or DWI, what is the most jail time you may be sentenced to?
- Up to 30 days
- Up to 90 days
- Up to two years
- Up to six months
Show answer
Correct answer: Up to six months
Court-convicted penalties include up to six months in jail for a first offense.
Source: Missouri Driver Guide (Revised August 2026), page 68 · Open this page in the manual (Manual page 68)
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For a first court-convicted offense of driving with a .08% BAC or more or DWI, what is the largest fine you may be ordered to pay?
- $500
- $250
- $750
- $2,000
Show answer
Correct answer: $500
Court-convicted penalties include a fine of up to $500 for a first offense.
Source: Missouri Driver Guide (Revised August 2026), page 68 · Open this page in the manual (Manual page 68)
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For a second court-convicted offense of driving with a .08% BAC or more or DWI, what is the most jail time you may be sentenced to?
- Up to 90 days
- Up to two years
- Up to one year
- Up to three years
Show answer
Correct answer: Up to one year
Court-convicted penalties include up to one year in jail for a second offense.
Source: Missouri Driver Guide (Revised August 2026), page 68 · Open this page in the manual (Manual page 68)
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For a second court-convicted offense of driving with a .08% BAC or more or DWI, what is the largest fine you may be ordered to pay?
- $1,000
- $250
- $2,500
- $10,000
Show answer
Correct answer: $1,000
Court-convicted penalties include a fine of up to $1,000 for a second offense.
Source: Missouri Driver Guide (Revised August 2026), page 68 · Open this page in the manual (Manual page 68)
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For a third court-convicted offense of driving with a .08% BAC or more or DWI, what is the most jail time you may be sentenced to?
- Up to 18 months
- Up to two years
- Up to four years
- Up to ten years
Show answer
Correct answer: Up to four years
Court-convicted penalties include up to four years in jail for a third offense.
Source: Missouri Driver Guide (Revised August 2026), page 68 · Open this page in the manual (Manual page 68)
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For a third court-convicted offense of driving with a .08% BAC or more or DWI, what is the largest fine you may be ordered to pay?
- $2,500
- $5,000
- $7,500
- $10,000
Show answer
Correct answer: $5,000
Court-convicted penalties include a fine of up to $5,000 for a third offense.
Source: Missouri Driver Guide (Revised August 2026), page 68 · Open this page in the manual (Manual page 68)
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For a fourth court-convicted offense of driving with a .08% BAC or more or DWI, what is the most jail time you may be sentenced to?
- Up to five years
- Up to nine years
- Up to ten years
- Up to seven years
Show answer
Correct answer: Up to seven years
Court-convicted penalties include up to seven years in jail for a fourth offense.
Source: Missouri Driver Guide (Revised August 2026), page 68 · Open this page in the manual (Manual page 68)
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For a fifth court-convicted offense of driving with a .08% BAC or more or DWI, how much jail time may you be sentenced to?
- Between one and three years
- Between five and 15 years
- Between three and eight years
- Between ten and 20 years
Show answer
Correct answer: Between five and 15 years
Court-convicted penalties include between five and 15 years in jail for a fifth offense.
Source: Missouri Driver Guide (Revised August 2026), page 68 · Open this page in the manual (Manual page 68)
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After a first court-convicted offense of driving with a .08% BAC or more or DWI, how long is your driver license suspended?
- 30 days
- 60 days
- One year
- 90 days
Show answer
Correct answer: 90 days
Court-convicted penalties include a 90-day suspension for a first offense.
Source: Missouri Driver Guide (Revised August 2026), page 68 · Open this page in the manual (Manual page 68)
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After a first court-convicted DWI or BAC offense, what lengths of Restricted Driving Privilege may you be eligible for?
- 90-day or 60-day
- 30-day or 15-day
- 180-day or 90-day
- One-year or 90-day
Show answer
Correct answer: 90-day or 60-day
A driver may be eligible for a 90-day or 60-day Restricted Driving Privilege after a first offense.
Source: Missouri Driver Guide (Revised August 2026), page 68 · Open this page in the manual (Manual page 68)
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What happens to your license after a court conviction for a second DWI or BAC offense within 5 years?
- Two-year license denial
- Three-year license denial
- Five-year license denial
- Six-month license suspension
Show answer
Correct answer: Five-year license denial
Court-convicted penalties include a five-year license denial for a second offense within 5 years.
Source: Missouri Driver Guide (Revised August 2026), page 68 · Open this page in the manual (Manual page 68)
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Only a BAC conviction with what date can be used toward a five-year license denial?
- August 28, 2009 or after
- January 1, 2000 or after
- January 1, 2005 or after
- August 28, 2019 or after
Show answer
Correct answer: August 28, 2009 or after
Only a BAC with a conviction date of August 28, 2009 or after can be used toward a five-year denial.
Source: Missouri Driver Guide (Revised August 2026), page 68 · Open this page in the manual (Manual page 68)
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What happens to your license after a court conviction for a third DWI or BAC offense?
- Two-year license denial
- Three-year license denial
- Ten-year license denial
- Seven-year license denial
Show answer
Correct answer: Ten-year license denial
Court-convicted penalties include a ten-year license denial for a third offense.
Source: Missouri Driver Guide (Revised August 2026), page 68 · Open this page in the manual (Manual page 68)
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Under the Abuse and Lose Law, for how long may your driver license be taken away if you are younger than 21 and commit a listed offense?
- 30 days
- 90 days
- 60 days
- One year
Show answer
Correct answer: 90 days
The law lets a license be taken away for 90 days for a driver younger than 21 who commits a listed offense.
Source: Missouri Driver Guide (Revised August 2026), page 69 · Open this page in the manual (Manual page 69)
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Under the Abuse and Lose Law, which of these may cause a driver younger than 21 to lose the license for 90 days?
- Driving without a passenger in the front seat
- Having a second speeding ticket in a year
- Parking in a no-parking zone
- Altering or misrepresenting a driver license
Show answer
Correct answer: Altering or misrepresenting a driver license
The law lists altering, modifying, or misrepresenting a driver license among the reasons a driver younger than 21 may lose the license for 90 days.
Source: Missouri Driver Guide (Revised August 2026), page 69 · Open this page in the manual (Manual page 69)
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Under the Abuse and Lose Law, for how long may your license be taken away if you are 21 or older and possess or use drugs while driving?
- 30 days
- One year
- 90 days
- Six months
Show answer
Correct answer: One year
A driver 21 or older may have the driver license taken away for one year for possessing or using drugs while driving.
Source: Missouri Driver Guide (Revised August 2026), page 69 · Open this page in the manual (Manual page 69)
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To get your license back after losing it for one year under the Abuse and Lose Law at age 21 or older, what must you do?
- Complete a driver improvement course
- Pass only a vision test
- Serve a 30-day jail sentence
- Retake the complete driver exam
Show answer
Correct answer: Retake the complete driver exam
Among the requirements to get the license back is to retake the complete driver exam.
Source: Missouri Driver Guide (Revised August 2026), page 69 · Open this page in the manual (Manual page 69)
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A state court may suspend or revoke your license for Minor in Possession (MIP) and other intoxication-related offenses if you are in which age group?
- Older than 15 and under 21
- Older than 12 and under 18
- Older than 18 and under 25
- Younger than 16 only
Show answer
Correct answer: Older than 15 and under 21
The guide says the court may act if you are older than 15 years of age and under 21 years of age.
Source: Missouri Driver Guide (Revised August 2026), page 69 · Open this page in the manual (Manual page 69)
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In the Minor in Possession offenses, what also counts as possessing intoxicating liquor?
- Sitting in a vehicle that contains it
- Standing near someone who has it
- Consuming it
- Attending a party where it is served
Show answer
Correct answer: Consuming it
The guide states that consumption constitutes possession of intoxicating liquor.
Source: Missouri Driver Guide (Revised August 2026), page 69 · Open this page in the manual (Manual page 69)
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What is the driver license suspension for a first Minor in Possession (MIP) offense?
- 30-day suspension
- 15-day suspension
- 60-day suspension
- One-year revocation
Show answer
Correct answer: 30-day suspension
For Minor in Possession, the penalty is a 30-day suspension for a first offense.
Source: Missouri Driver Guide (Revised August 2026), page 69 · Open this page in the manual (Manual page 69)
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What is the driver license penalty for a second Minor in Possession (MIP) offense?
- 30-day suspension
- 60-day suspension
- 90-day suspension
- One-year revocation
Show answer
Correct answer: 90-day suspension
For Minor in Possession, the penalty is a 90-day suspension for a second offense.
Source: Missouri Driver Guide (Revised August 2026), page 69 · Open this page in the manual (Manual page 69)
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What is the driver license penalty for a third Minor in Possession (MIP) offense?
- 30-day suspension
- One-year revocation
- Six-month suspension
- Two-year revocation
Show answer
Correct answer: One-year revocation
For Minor in Possession, the penalty is a one-year revocation for a third offense.
Source: Missouri Driver Guide (Revised August 2026), page 69 · Open this page in the manual (Manual page 69)
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What happens to your driver license if a police officer stops you and you refuse to take a chemical test to determine your BAC?
- It is taken away for 30 days
- It is taken away for 90 days
- It is taken away for one year
- It is taken away for five years
Show answer
Correct answer: It is taken away for one year
Refusing a chemical test of your BAC results in the driver license being taken away for one year.
Source: Missouri Driver Guide (Revised August 2026), page 70 · Open this page in the manual (Manual page 70)
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Which program must you show you completed to have your license reinstated after an intoxication-related offense?
- Substance Awareness Traffic Offender Program (SATOP)
- Alcohol Safety Awareness Offender Program (ASAOP)
- Driver Improvement Traffic Offender Program (DITOP)
- Highway Safety Awareness Course Program (HSACP)
Show answer
Correct answer: Substance Awareness Traffic Offender Program (SATOP)
Reinstatement requires a form showing completion of a Substance Awareness Traffic Offender Program (SATOP) or comparable program.
Source: Missouri Driver Guide (Revised August 2026), page 70 · Open this page in the manual (Manual page 70)
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For reinstatement, an ignition interlock device must be installed if you had an alcohol conviction with a BAC of at least what level?
- .04%
- .10%
- .15%
- .20%
Show answer
Correct answer: .15%
An IID is required if there was more than one intoxication-related contact, or an alcohol conviction with a BAC of .15% or higher or property damage or bodily harm.
Source: Missouri Driver Guide (Revised August 2026), page 70 · Open this page in the manual (Manual page 70)
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To which parts of the vehicle is an ignition interlock device (IID) connected?
- The ignition, brakes, and turn signals
- The ignition, horn, and headlights
- The ignition, fuel pump, and windshield wipers
- The ignition, steering wheel, and seat belts
Show answer
Correct answer: The ignition, horn, and headlights
An IID is a mechanical unit connected to the vehicle’s ignition, horn, and headlights.
Source: Missouri Driver Guide (Revised August 2026), page 70 · Open this page in the manual (Manual page 70)
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What does an ignition interlock device (IID) measure?
- The concentration of alcohol in a person’s blood sample
- The driver’s heart rate while the vehicle is moving
- The driver’s reaction time at each start
- The concentration of alcohol in a person’s breath
Show answer
Correct answer: The concentration of alcohol in a person’s breath
An IID measures the concentration of alcohol in a person’s breath.
Source: Missouri Driver Guide (Revised August 2026), page 70 · Open this page in the manual (Manual page 70)
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When does an ignition interlock device require the vehicle operator to provide a breath sample?
- Only before starting the vehicle each time it is used
- Before starting the vehicle and periodically during operation
- Only when a police officer stops the vehicle on the road
- Only at the monthly service visit, never while driving
Show answer
Correct answer: Before starting the vehicle and periodically during operation
The IID requires a breath sample before starting the vehicle and periodically during the operation of the vehicle.
Source: Missouri Driver Guide (Revised August 2026), page 70 · Open this page in the manual (Manual page 70)
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For how long must an ignition interlock device be maintained when it is required for reinstatement?
- At least 30 days from the reinstatement date
- At least 90 days from the reinstatement date
- At least two years from the reinstatement date
- At least six months from the reinstatement date
Show answer
Correct answer: At least six months from the reinstatement date
The IID must be maintained for a minimum of six months from the reinstatement date.
Source: Missouri Driver Guide (Revised August 2026), page 70 · Open this page in the manual (Manual page 70)
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When an ignition interlock device is required for reinstatement, during which period must there be no violations?
- The last three months
- The first month
- The first three months
- The entire first year
Show answer
Correct answer: The last three months
The IID must be maintained for at least six months without any violations in the last three months.
Source: Missouri Driver Guide (Revised August 2026), page 70 · Open this page in the manual (Manual page 70)
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How often must a required ignition interlock device be serviced?
- Every week
- Every six months
- Every month
- Once a year
Show answer
Correct answer: Every month
The driver must pay for having the device installed and for having it serviced every month.
Source: Missouri Driver Guide (Revised August 2026), page 70 · Open this page in the manual (Manual page 70)
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What happens to your driving privilege if you fail to maintain a required ignition interlock device?
- It is re-suspended
- It is canceled permanently
- It is changed to a learner permit
- It stays valid with a warning
Show answer
Correct answer: It is re-suspended
If you fail to maintain the IID, your driving privilege will be re-suspended.
Source: Missouri Driver Guide (Revised August 2026), page 70 · Open this page in the manual (Manual page 70)
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Besides driver licensing requirements, what may a court impose for a first DWI conviction?
- A mandatory vehicle sale
- A permanent license plate change
- Use of an ignition interlock device
- A required move to another county
Show answer
Correct answer: Use of an ignition interlock device
A court may impose other requirements such as IID use for the first DWI conviction.
Source: Missouri Driver Guide (Revised August 2026), page 70 · Open this page in the manual (Manual page 70)
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What happens if you are convicted in court of failing to have a legally required ignition interlock device installed?
- Your driving privilege is revoked for 30 days
- Your driving privilege is revoked for one year
- Your driving privilege is suspended for 90 days
- Your driving privilege is revoked for five years
Show answer
Correct answer: Your driving privilege is revoked for one year
A conviction for failing to have a required IID revokes the driving privilege for one year.
Source: Missouri Driver Guide (Revised August 2026), page 70 · Open this page in the manual (Manual page 70)
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How long is your driving privilege taken away for a second conviction of failing to have a required ignition interlock device?
- One year
- Two years
- Ten years
- Five years
Show answer
Correct answer: Five years
A second offense of failing to have a required IID requires the driving privilege to be taken away for five years.
Source: Missouri Driver Guide (Revised August 2026), page 70 · Open this page in the manual (Manual page 70)
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Which statement about medicine and DWI in Missouri is correct?
- DWI applies only to alcohol and illegal drugs
- An over-the-counter medicine that impairs driving can lead to DWI
- Medicine taken as directed can never lead to a DWI charge
- Only prescription medicine can lead to a DWI charge
Show answer
Correct answer: An over-the-counter medicine that impairs driving can lead to DWI
A person can be charged with DWI for impairment by alcohol, illegal drugs, prescription medication, over-the-counter medication, or any combination.
Source: Missouri Driver Guide (Revised August 2026), page 71 · Open this page in the manual (Manual page 71)
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How do Missouri DWI penalties compare when the impairment is from drugs rather than alcohol?
- They are lighter for prescription drugs
- They are heavier for drugs than for alcohol
- They apply only to illegal drugs
- They are exactly the same
Show answer
Correct answer: They are exactly the same
The penalties for DWI are exactly the same regardless of whether the impairment is from drugs or alcohol.
Source: Missouri Driver Guide (Revised August 2026), page 71 · Open this page in the manual (Manual page 71)
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Which effect of alcohol on vision does the guide list?
- It can impair night vision
- It can widen side vision
- It can sharpen color perception
- It can improve night vision
Show answer
Correct answer: It can impair night vision
Alcohol can affect vision, including slowing eye muscle function, altering visual perception, and impairing night vision.
Source: Missouri Driver Guide (Revised August 2026), page 71 · Open this page in the manual (Manual page 71)
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How does alcohol affect your reflexes?
- It speeds them up
- It sharpens them briefly
- It slows them
- It does not change them
Show answer
Correct answer: It slows them
Alcohol slows reflexes and decreases reaction time, making it unsafe to react quickly to situations.
Source: Missouri Driver Guide (Revised August 2026), page 71 · Open this page in the manual (Manual page 71)
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At what BAC is it illegal for an adult driver who is 21 or older and not driving a commercial vehicle to drive?
- 0.08% or more
- 0.05% or more
- 0.10% or more
- 0.15% or more
Show answer
Correct answer: 0.08% or more
It is illegal to drive with a blood alcohol content of 0.08% or more.
Source: Missouri Driver Guide (Revised August 2026), page 71 · Open this page in the manual (Manual page 71)
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At what BAC is it illegal for a commercial vehicle driver to drive?
- 0.05%
- 0.06%
- 0.04%
- 0.10%
Show answer
Correct answer: 0.04%
The guide gives 0.04% as the illegal BAC for commercial vehicle drivers.
Source: Missouri Driver Guide (Revised August 2026), page 71 · Open this page in the manual (Manual page 71)
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What BAC applies to a driver who is under 21 years of age?
- 0.05%
- 0.02%
- 0.06%
- 0.10%
Show answer
Correct answer: 0.02%
The guide gives 0.02% as the BAC limit for drivers under 21.
Source: Missouri Driver Guide (Revised August 2026), page 71 · Open this page in the manual (Manual page 71)
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Under what age is it illegal to possess or purchase alcohol?
- 16
- 18
- 19
- 21
Show answer
Correct answer: 21
It is illegal to possess or purchase alcohol if you are under the age of 21.
Source: Missouri Driver Guide (Revised August 2026), page 71 · Open this page in the manual (Manual page 71)
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According to the guide, how many drinks could in many cases place you over the legal blood alcohol limit?
- Four
- Two
- Six
- Eight
Show answer
Correct answer: Two
Even one drink is likely to affect your ability to drive safely and in many cases two drinks could place you over the legal blood alcohol limit.
Source: Missouri Driver Guide (Revised August 2026), page 71 · Open this page in the manual (Manual page 71)
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Which statement about medications and driving is correct?
- Medications taken as directed never impair driving
- Only illegal drugs can impair driving
- Over-the-counter medicines never impair driving
- Even medicine taken as directed can impair your driving
Show answer
Correct answer: Even medicine taken as directed can impair your driving
All medications, both prescription and over-the-counter, are potentially dangerous and can impair driving, even when taken as directed.
Source: Missouri Driver Guide (Revised August 2026), page 71 · Open this page in the manual (Manual page 71)
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If you are not sure whether a medication will affect your driving, whom does the guide say to check with?
- Your physician or pharmacist
- Your insurance company agent
- A license office employee
- A police officer on duty
Show answer
Correct answer: Your physician or pharmacist
The guide says to check with your physician or pharmacist and read the warning label.
Source: Missouri Driver Guide (Revised August 2026), page 71 · Open this page in the manual (Manual page 71)
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What effect can over-the-counter medicines for colds and allergies have on you?
- They can make you more alert for several hours
- They can improve your night vision
- They can make you drowsy
- They have no effect on driving ability
Show answer
Correct answer: They can make you drowsy
Over-the-counter medicines for colds and allergies can make you drowsy and affect your driving ability.
Source: Missouri Driver Guide (Revised August 2026), page 71 · Open this page in the manual (Manual page 71)
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What can pep pills, “uppers,” and diet pills cause later, after making a driver more alert for a short time?
- Nervousness, dizziness, and poor concentration
- Longer-lasting alertness and better focus
- Sharper vision at night and better focus
- Faster reaction time and steadier hands
Show answer
Correct answer: Nervousness, dizziness, and poor concentration
After the short period of alertness, these pills can cause a person to be nervous, dizzy, and not able to concentrate.
Source: Missouri Driver Guide (Revised August 2026), page 71 · Open this page in the manual (Manual page 71)
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What kind of drug should you not take before driving?
- Any drug that comes in a liquid form
- Any drug you have taken at least once before
- Any drug that “may cause drowsiness or dizziness”
- Any drug that is sold without a prescription
Show answer
Correct answer: Any drug that “may cause drowsiness or dizziness”
Any drug that “may cause drowsiness or dizziness” is one you should not take before driving.
Source: Missouri Driver Guide (Revised August 2026), page 71 · Open this page in the manual (Manual page 71)
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What does the guide say about taking medications prescribed for someone else?
- It is safe if the dose is small
- It is dangerous and illegal
- It is legal if you have the same illness
- It is allowed if you do not drive afterward
Show answer
Correct answer: It is dangerous and illegal
The guide says not to take medications prescribed for someone else because it is dangerous and illegal.
Source: Missouri Driver Guide (Revised August 2026), page 71 · Open this page in the manual (Manual page 71)
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What does the guide advise about mixing alcohol with your medications?
- It is safe with over-the-counter medicines only
- It is safe if you drink only a small amount
- It is safe if you wait one hour before driving
- Do not mix them, prescribed or over the counter
Show answer
Correct answer: Do not mix them, prescribed or over the counter
The guide says not to mix alcohol with medications, whether prescribed or over the counter.
Source: Missouri Driver Guide (Revised August 2026), page 71 · Open this page in the manual (Manual page 71)
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According to the guide, when is it legal and safe to drive while under the influence of marijuana, even though medical marijuana was approved by Missouri voters?
- When the marijuana was prescribed
- Never
- When it is used in small amounts
- When you drive only short distances
Show answer
Correct answer: Never
The guide says it is never legal or safe to drive while under the influence of marijuana.
Source: Missouri Driver Guide (Revised August 2026), page 72 · Open this page in the manual (Manual page 72)
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Which effect of marijuana on drivers does the guide list?
- It can sharpen your judgment of distance
- It can shorten your reaction time a lot
- It can improve your coordination slightly
- It can impair judgment of time and distance
Show answer
Correct answer: It can impair judgment of time and distance
Marijuana can impair cognitive function, impair judgment of time and distance, and decrease coordination.
Source: Missouri Driver Guide (Revised August 2026), page 72 · Open this page in the manual (Manual page 72)
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What happened when drivers used alcohol together with marijuana in the research studies the guide describes?
- They were even more impaired, with even more lane weaving
- They were less impaired than with marijuana alone
- They showed no change in lane weaving
- They showed faster reaction times
Show answer
Correct answer: They were even more impaired, with even more lane weaving
Research found that the use of alcohol with marijuana made drivers even more impaired, causing even more lane weaving.
Source: Missouri Driver Guide (Revised August 2026), page 72 · Open this page in the manual (Manual page 72)
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Which is one of the greatest predictors of someone developing an addiction?
- Late use
- Using only prescribed medication
- Early use
- Working long hours
Show answer
Correct answer: Early use
One of the greatest predictors of someone developing an addiction is early use.
Source: Missouri Driver Guide (Revised August 2026), page 72 · Open this page in the manual (Manual page 72)
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Why is a young person more susceptible to developing a substance use disorder?
- A young brain can be damaged quicker and more severely
- Young people have slower reflexes than most adults
- Young people drink larger amounts than adults do
- Young people are less likely to seek treatment later
Show answer
Correct answer: A young brain can be damaged quicker and more severely
A young person’s under-developed brain can become damaged quicker and more severely than an adult brain using the same substances.
Source: Missouri Driver Guide (Revised August 2026), page 72 · Open this page in the manual (Manual page 72)
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What does the guide advise if you are going to drink?
- Drive only on roads that you know very well
- Drive slowly and stay in the right-hand lane
- Let someone else drive who has not been drinking
- Wait ten minutes after your last drink and drive
Show answer
Correct answer: Let someone else drive who has not been drinking
The guide advises that if you are going to drink, you let someone else drive who has not been drinking.
Source: Missouri Driver Guide (Revised August 2026), page 67 · Open this page in the manual (Manual page 67)
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How much alcohol may affect your driving ability?
- Only more than two drinks
- Even a small amount
- Only more than four drinks
- Only an amount over the legal limit
Show answer
Correct answer: Even a small amount
Even a small amount of alcohol may affect your driving ability.
Source: Missouri Driver Guide (Revised August 2026), page 67 · Open this page in the manual (Manual page 67)