Colorado: Alcohol and drugs — Part 4 Practice Test
Questions in this part include: “What does the handbook say about a THC permissible inference level for DWAI?” · “If a driver is suspected of driving while impaired, which test can law enforcement officers require?”
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Questions are original and based on the official manual "Colorado Driver Handbook" (DR 2337, January 2025), Colorado Division of Motor Vehicles (DMV).
All 16 questions in this practice test
Take the test above first, then use this list to study. Tap “Show answer” to see the correct answer and explanation.
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What does the handbook say about a THC permissible inference level for DWAI?
- It is 2 nanograms per milliliter
- It is the same as for DUI
- There is none
- It is half the DUI level
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Correct answer: There is none
The handbook says there is no THC permissible inference level for DWAI.
Source: Colorado Driver Handbook (DR 2337, January 2025), page 5 · Open this page in the manual (Manual page 5)
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On what are most marijuana impaired drivers convicted, according to the handbook?
- Behavioral symptoms as well as blood THC levels
- A blood THC level taken alone as proof
- The result of a roadside written quiz
- A review of the driver’s medical history
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Correct answer: Behavioral symptoms as well as blood THC levels
Convictions rest on behavioral symptoms as well as blood THC levels.
Source: Colorado Driver Handbook (DR 2337, January 2025), page 5 · Open this page in the manual (Manual page 5)
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What is polydrug impairment?
- Impairment caused by one illegal drug used for many days
- Impairment from alcohol that lasts more than one day
- Impairment that only affects drivers on long trips
- Impairment caused by using two or more drugs simultaneously
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Correct answer: Impairment caused by using two or more drugs simultaneously
Polydrug impairment comes from using two or more drugs at the same time, in any combination.
Source: Colorado Driver Handbook (DR 2337, January 2025), page 5 · Open this page in the manual (Manual page 5)
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What can mixing drugs do, according to the handbook?
- Cancel out the effects of each drug
- Increase the substance’s effects
- Make each drug leave the body faster
- Make impairment easier to notice
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Correct answer: Increase the substance’s effects
The handbook warns that mixing drugs can increase the substance’s effects.
Source: Colorado Driver Handbook (DR 2337, January 2025), page 5 · Open this page in the manual (Manual page 5)
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According to Colorado’s data in the handbook, polydrug impairment is more common than impairment by any single drug other than which one?
- Alcohol
- Marijuana
- Prescription medications
- Heroin
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Correct answer: Alcohol
Polydrug impairment is more common than impairment by any single drug other than alcohol.
Source: Colorado Driver Handbook (DR 2337, January 2025), page 5 · Open this page in the manual (Manual page 5)
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How can illegal drugs such as LSD, methamphetamine and heroin affect a driver?
- They always make a driver more careful and cautious
- They only affect drivers who take them with a meal
- They can give a false sense of alertness
- They improve reaction time in simple situations
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Correct answer: They can give a false sense of alertness
The handbook says these drugs can give a false sense of alertness and self-confidence or cause drowsiness.
Source: Colorado Driver Handbook (DR 2337, January 2025), page 5 · Open this page in the manual (Manual page 5)
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Drivers are routinely convicted of Colorado’s impaired driving laws regardless of what?
- Whether the driver was stopped at night
- The drug causing it and its level in blood or saliva
- Whether the driver has a clean record
- Whether the vehicle was registered in Colorado
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Correct answer: The drug causing it and its level in blood or saliva
Convictions happen regardless of the drug causing the impairment and regardless of the drug level found.
Source: Colorado Driver Handbook (DR 2337, January 2025), page 5 · Open this page in the manual (Manual page 5)
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What does Colorado’s express consent law mean?
- You agree to let officers search your vehicle
- You agree to attend a class after any traffic ticket
- You agree to take a written test every year
- You agree to a chemical test for alcohol and/or drugs
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Correct answer: You agree to a chemical test for alcohol and/or drugs
Driving in Colorado means you agree to take a chemical test for alcohol and/or drugs.
Source: Colorado Driver Handbook (DR 2337, January 2025), page 5 · Open this page in the manual (Manual page 5)
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If a driver is suspected of driving while impaired, which test can law enforcement officers require?
- A hair sample test
- A sweat patch test
- A urine test
- A fingernail test
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Correct answer: A urine test
Officers can require a chemical test of blood, breath, saliva or urine.
Source: Colorado Driver Handbook (DR 2337, January 2025), page 5 · Open this page in the manual (Manual page 5)
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What happens to your driver license if you refuse to take the chemical test or do not comply with being tested?
- It is revoked for one year
- It is suspended for 30 days
- It is revoked for six months
- It is revoked for three years
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Correct answer: It is revoked for one year
Refusing the test or not complying leads to a one-year revocation.
Source: Colorado Driver Handbook (DR 2337, January 2025), page 5 · Open this page in the manual (Manual page 5)
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After refusing a chemical test, for how long must you have an ignition interlock device on any vehicle you drive?
- Six months
- One year
- Five years
- Two years
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Correct answer: Two years
The handbook requires an ignition interlock device for two years after a refusal.
Source: Colorado Driver Handbook (DR 2337, January 2025), page 5 · Open this page in the manual (Manual page 5)
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What does an ignition interlock device require from the driver?
- A fingerprint scan at the start of each month
- Breath samples before starting and while driving
- A blood sample whenever an officer stops you
- A signed driver form before every single trip
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Correct answer: Breath samples before starting and while driving
The device requires a breath sample before the engine starts and periodic samples while driving.
Source: Colorado Driver Handbook (DR 2337, January 2025), page 5 · Open this page in the manual (Manual page 5)
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What happens when an ignition interlock device detects an elevated alcohol concentration level?
- The vehicle will not start
- The horn sounds until the driver stops
- The device turns off for one hour
- The license is cancelled on the spot
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Correct answer: The vehicle will not start
The handbook says the vehicle will not start if the device detects an elevated alcohol concentration.
Source: Colorado Driver Handbook (DR 2337, January 2025), page 5 · Open this page in the manual (Manual page 5)
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If other suspensions or revocations come from the same incident as a test refusal, how are they handled?
- They run at the same time as the revocation
- Only the longest one is kept
- They are added onto the end of the revocation
- They are cancelled after the first year
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Correct answer: They are added onto the end of the revocation
Other suspensions or revocations from the same incident are added consecutively onto the end of the revocation.
Source: Colorado Driver Handbook (DR 2337, January 2025), page 5 · Open this page in the manual (Manual page 5)
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Which penalties can alcohol or drug related violations include, according to the handbook?
- A written warning letter and nothing more
- Jail, fines and suspension of driving privileges
- Community service and no other penalties
- A small fine paid by the registered vehicle owner
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Correct answer: Jail, fines and suspension of driving privileges
The handbook says the penalties are very tough and can include jail, fines and suspension.
Source: Colorado Driver Handbook (DR 2337, January 2025), page 5 · Open this page in the manual (Manual page 5)
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What does Colorado law say about plea bargaining an alcohol or drug related driving offense?
- It is allowed for a first offense
- It is allowed if you complete a class
- It is allowed if you were not driving at night
- The law does not allow you to plea bargain out of it
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Correct answer: The law does not allow you to plea bargain out of it
Colorado law does not allow you to plea bargain out of an alcohol or drug related driving offense.
Source: Colorado Driver Handbook (DR 2337, January 2025), page 5 · Open this page in the manual (Manual page 5)