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Tennessee driving lesson · Alcohol, Drugs & DUI

Drugs, the DUI law & implied consent

A 3-minute lesson from the Tennessee course. Read the rules and examples, follow the handbook page references, and check your understanding before you move on.

Read time
3 minutes
Course unit
Alcohol, Drugs & DUI
Checkpoint questions
6
Source pages
95

DUI isn't only about alcohol. Prescription pills, over-the-counter cold medicine and marijuana can all impair you — and Tennessee punishes drug DUIs exactly like alcohol DUIs. By driving here, you've also agreed ahead of time to be tested.

Know the rule

Mixing alcohol with another depressant, like tranquilizers or sedatives, doesn't just add the effects — it multiplies them.

Handbook p. 95 ↗

Know the rule

A prescription is NO defense to a DUI. If your doctor prescribes a tranquilizer or sedative, ask how it will affect your driving.

Handbook p. 95 ↗

Know the rule

Cold tablets, cough syrups and allergy remedies may contain antihistamines, alcohol or codeine. Read the labels ('may cause drowsiness,' 'do not operate machinery') and ask a doctor or pharmacist.

Handbook p. 95 ↗

Know the rule

Studies show marijuana and other drugs also affect judgment and motor skills.

Handbook p. 95 ↗

DUI in Tennessee

Driving or being in physical control of a vehicle on a public road or place like a shopping center while under the influence of an intoxicant or drug, or with a BAC of .08+.

Handbook p. 95 ↗

Know the rule

You can register a BAC of .00 and still be convicted of DUI if drugs impair you. A BAC under .08 doesn't clear you.

Handbook p. 95 ↗

Know the rule

Erratic driving or an inappropriate speed — too fast or too slow — is enough cause for an officer to stop you and investigate.

Handbook p. 95 ↗

Know the rule

DUI penalties are the same whether you were drinking alcohol or taking drugs, even prescription or over-the-counter drugs.

Handbook p. 95 ↗

Implied Consent Law

By driving in Tennessee you've consented to a test of your blood's alcohol or drug content when an officer with reasonable grounds asks.

Handbook p. 95 ↗
12 months

Likely license suspension for refusing the test after a DUI arrest

Handbook p. 95 ↗

No Refusal law

Passed in 2012, it lets officers seek search warrants for blood samples from suspected impaired drivers.

Handbook p. 95 ↗

Put it into practice

You take a prescribed muscle relaxant labeled 'may cause drowsiness,' then drive and weave across the line. Your BAC is .00, but you can still be convicted of DUI — and 'my doctor prescribed it' is not a defense.

Check your understanding

Read the question, decide on an answer, then open it to check the explanation. These are Roadwise study questions based on the source handbook.

Tennessee's Implied Consent Law means that by driving in the state, you have already agreed to:
  1. Pay any DUI fine before a court date
  2. A test of your blood's alcohol or drug content
  3. Give up your right to an attorney
  4. A search of your vehicle at any time

Answer: A test of your blood's alcohol or drug content

By driving in Tennessee, you have given implied consent to be tested for alcohol or drug content when an officer has reasonable grounds to suspect DUI.

Handbook p. 95 ↗
If you refuse a test requested under the Implied Consent Law after a DUI arrest, your license may be suspended for:
  1. One month
  2. Twelve months
  3. Six months
  4. Five years

Answer: Twelve months

Refusing the test after an arrest for DUI generally results in a court-ordered suspension of 12 months.

Handbook p. 95 ↗
The 'No Refusal' law, passed in 2012, allows law enforcement to:
  1. Revoke a license without a hearing
  2. Skip the implied consent process
  3. Seek search warrants for blood samples
  4. Arrest a driver without probable cause

Answer: Seek search warrants for blood samples

The No Refusal law allows officers to seek search warrants for blood samples in cases of suspected impaired driving.

Handbook p. 95 ↗
Driving under the influence of prescription drugs, compared to alcohol, carries:
  1. No penalty since the drug was prescribed
  2. A lesser, reduced penalty
  3. Only a warning for a first offense
  4. The same penalties as alcohol DUI

Answer: The same penalties as alcohol DUI

Driving while under the influence of drugs, even prescription drugs, carries the same penalties as for alcohol.

Handbook p. 96 ↗
A driver can be convicted of DUI in Tennessee even with a BAC of .00 percent if impaired by drugs.
  1. True
  2. False

Answer: True

A driver can register a BAC of .00 percent and still be convicted of DUI if impaired by drugs producing stimulating effects.

Handbook p. 95 ↗
It is safe to drive after taking any medication as long as you feel fine, even if the label warns of drowsiness.
  1. True
  2. False

Answer: False

You should read medication labels and heed warnings about drowsiness, since even legal drugs can impair driving ability.

Handbook p. 95 ↗
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