Alcohol and the law — Montana Permit Test
Alcohol and the law on the Montana permit test — 5 rules, each with the reason behind it and a question on it while it is fresh.
The rules
In Montana you may not buy or drink alcohol unless you are 21 or older.
A teen driver who drinks breaks the law before ever starting the car.
You are not allowed to buy or consume alcohol unless you are 21 years of age or older.
In Montana you can be arrested for driving with a blood alcohol concentration (BAC) of 0.08% or more, or for driving under the influence.
A driver who feels fine at a high BAC is still slower to brake than they believe.
You can be arrested for driving with a blood alcohol concentration (BAC) of 0.08% or more, or while driving under the influence.
In Montana the BAC limit for a driver under 21 is 0.02.
A young driver who thinks the adult limit applies can be over their own limit after a single drink.
The BAC for a driver under 21 years of age is 0.02.
BAC is the percentage of alcohol in your blood, and it is usually found by a breath, blood or urine test.
A driver who thinks only a blood draw counts may not realize a roadside breath test measures the same thing.
BAC is the percentage of alcohol in your blood, and is usually determined by a breath, blood, or urine test.
If a police officer asks you to take a BAC test, you must do so; you can lose your driver license if you refuse.
Without this rule, a drinking driver could simply refuse the test and escape any proof.
If a police officer asks you to take a test, you must do so.
On the test
How old must you be to buy or drink alcohol in Montana?
21 years or older. A teen driver who drinks breaks the law before ever starting the car. Montana Driver Manual, p.72: “You are not allowed to buy or consume alcohol unless you are 21 years of age or older.”
How this works
Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.
You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.
Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.
What it costs
- One payment, once — not a subscription. Nothing renews and there is nothing to cancel, for an exam you sit one time.
- Free to start: a 10-question test and the first section of cards. No sign-up and no account.
- Paying opens the rest of the cards, unlimited full-length practice tests, and retests built from exactly the questions you got wrong.
- Every level up to Prepared — 3 tests passed in a row.
- Do the work, fail the real exam, and we refund you.
Where these come from
Every rule here is checked against Montana Driver Manual, published by the Montana Department of Justice, and against the state code itself. Last checked 2026-10-04.
- src/assets/drivers-manuals/MT.pdf (Montana Driver Manual, Revised April 2024, Montana Department of Justice, Motor Vehicle Division, retrieved 2026-09-14 and re-checked 2026-10-04; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/MT.pages.txt (scripts/mt-text.sh: pdftotext -layout except printed pp.24-26, which are plain; the fixture every citation here was cut from and verified against; sha256 pinned in SOURCES.json)
- src/assets/drivers-manuals/MT-exam.html (Administrative Rules of Montana 23.3.121, Road Signs and Road Rules, as reproduced by the Legal Information Institute, read 2026-10-04; states the seven-miss pass mark; sha256 pinned under examSource)
- https://mvdmt.gov/forms-driver-license/ (read 2026-10-04; links the manual)