Drug and alcohol questions are part of the written knowledge test in every state
The written knowledge test includes questions about how drugs and alcohol affect your ability to drive safely. These are not separate tests — they are mixed into the same exam you take to get your permit or license. The number of questions varies by state, but most states ask between 2 and 8 questions about impairment, and the answers come directly from your state's driver manual.
You will not be tested on your personal drug or alcohol use, and the test does not measure whether you have consumed anything. The questions ask about the effects of impairment on reaction time, judgment, vision, and vehicle control — the same way the test covers speed limits or right-of-way rules. Getting these questions wrong can lower your overall score and cause you to fail the test.
The content is the same whether you are renewing a license, upgrading to a commercial license, or taking the test for the first time. If you have a commercial driver license (CDL), you may see additional questions about federal rules on drug and alcohol testing in the workplace.
Key Takeaways
- Drug and alcohol questions are part of your state's written knowledge test and cover how impairment affects driving ability, not your personal use.
- Most states ask 2 to 8 questions on this topic, and the answers are in your state's official driver manual.
- You must pass the entire test, including these questions, to receive your permit or license.
- The questions are the same for all license types except CDL, which includes additional federal workplace testing rules.
What the questions actually cover
The test asks about the physical and mental effects of alcohol and drugs on driving. Common topics include how alcohol slows reaction time, impairs judgment, reduces vision, and affects balance and coordination. Questions may ask at what blood alcohol concentration (BAC) a driver is considered legally impaired, or how long alcohol stays in your system.
Drug questions cover both illegal drugs and prescription or over-the-counter medications. The test explains that some medications cause drowsiness, dizziness, or blurred vision — effects that make driving unsafe. You may see questions about marijuana, opioids, stimulants, or sedating medications, and how each type affects driving ability.
Questions also cover the legal consequences of driving under the influence (DUI) or driving while impaired (DWI), including license suspension, fines, and jail time. Some states ask about implied consent laws, which require you to submit to a breath or blood test if stopped by police.
Where to find the answers in your state manual
Your state's driver manual contains all the information needed to answer these questions correctly. The manual is free and available online from your state's DMV website. Search for "[Your State] DMV driver manual" or "[Your State] driver handbook" to find the PDF or web version.
The drug and alcohol section is usually labeled clearly — look for headings like "Alcohol and Drugs," "Impaired Driving," "DUI/DWI," or "Substance Abuse." Read this section carefully and take notes on specific numbers (like legal BAC limits) and effects (like how alcohol affects vision). Many people miss questions because they skim the manual instead of reading the exact wording the test uses.
Some states also offer study guides, flashcards, or practice tests on their DMV website. These tools often highlight the exact questions that appear on the real test, making them worth using before you sit for the exam.
How many questions you need to answer correctly
The number of drug and alcohol questions on your test depends on your state and the type of license you are seeking. Most states include these questions as part of a larger test of 30 to 50 questions total. You typically must score 80 percent or higher to pass the entire test.
If your test has 40 questions and you must score 80 percent, you can miss no more than 8 questions total — across all topics, not just drug and alcohol. This means getting 2 or 3 drug and alcohol questions wrong could cause you to fail, depending on how many other questions you miss.
Some states allow you to retake the test the same day if you fail, while others require you to wait 1 to 7 days before trying again. Check your state's DMV website for the retake policy and any fees that explore.
Common mistakes on drug and alcohol questions
The most common mistake is guessing based on general knowledge instead of using the exact information in your state manual. For example, you might know that alcohol affects judgment, but the test may ask a specific question like "At what BAC level is a driver considered legally impaired in your state?" The answer is usually 0.08 percent for drivers 21 and older, but some states have lower limits for drivers under 21 or commercial drivers. Guessing without checking the manual costs you points.
Another mistake is confusing the legal BAC limit with the point at which impairment begins. Many states teach that impairment can start at much lower levels — sometimes 0.02 percent or even lower — even though the legal limit is 0.08 percent. The test may ask which statement is true, and picking the wrong one is an straightforward way to fail.
A third mistake is overlooking medication questions. Many people assume the test only covers alcohol and illegal drugs, then miss questions about prescription painkillers, antihistamines, or cold medicine. Your state manual lists common medications that affect driving, and the test expects you to know them.
How to study for these questions
Start by reading the drug and alcohol section of your state manual at least twice. The first time, read for understanding. The second time, highlight or write down specific numbers, legal limits, and effects. Create a study sheet with the key facts your state emphasizes.
Use practice tests if your state offers them. Many DMV websites include free online practice exams that show you the exact format and wording of real test questions. Take the practice test, check your answers against the manual, and study any topics where you scored poorly.
If you have access to a study guide or flashcard app, use it to drill the specific questions your state asks. Some apps let you filter by topic, so you can focus only on drug and alcohol questions. Spend at least 30 minutes studying this section before you take the real test.
What happens if you fail because of these questions
If you fail the written test, you do not automatically fail because of drug and alcohol questions. Your score is calculated across all topics. However, if you notice you missed most of the drug and alcohol questions, you know exactly what to study before your retake.
When you retake the test, you will see different questions — the test does not repeat the same questions. This means studying the manual thoroughly is more important than memorizing specific questions. Focus on understanding the concepts: how alcohol and drugs affect the body, what the legal limits are in your state, and what the consequences are for impaired driving.
If you fail the test multiple times, ask the DMV staff whether they can point you to specific sections of the manual you should review. Some DMV offices offer in-person help or can direct you to free study resources in your area.
Frequently Asked Questions
Do I have to answer drug and alcohol questions if I am under 21?
Yes. All applicants, regardless of age, must answer these questions as part of the written test. The questions cover how drugs and alcohol affect driving ability, not your legal right to drink. Your state manual will include information about lower BAC limits for drivers under 21, and you are expected to know those limits.
Will the test ask about my personal drug or alcohol use?
No. The written test does not ask personal questions about whether you use drugs or alcohol. It only asks about the effects of impairment on driving and the legal consequences of DUI or DWI. Your answers do not affect your medical record or any other record.
What if I do not understand a drug or alcohol question on the test?
Read the question carefully and eliminate answers you know are wrong. If you are still unsure, make your best guess based on what you learned in the manual. You cannot ask the test administrator for help with the content of the question, but you can ask for clarification if the wording is unclear or if you did not hear it correctly.
Are the drug and alcohol questions the same in every state?
No. Each state writes its own test based on its own laws and driver manual. The general topics are similar — impairment effects, legal limits, consequences — but the specific questions and answers vary. You must study your state's manual, not another state's.
Can I retake just the drug and alcohol section if I fail?
No. If you fail the written test, you must retake the entire test. You cannot retake individual sections or topics. This is why studying the whole manual, not just one section, is important.