Which is a common sign of impairment indicating possible DUI during a traffic stop?

• A. Polished shoes.
• B. Odor of alcohol.
• C. Bright colored hair.
• D. Slow driving.

Answer: (B)

Impairment signs during a traffic stop hinge on cues that clearly point to alcohol or drug effects. The odor of alcohol is a reliable and direct indicator because it comes from recent drinking and can be detected by the officer on the person or the vehicle, helping establish probable cause to conduct field sobriety tests or a chemical test. Other features like polished shoes or bright colored hair don’t relate to impairment, and slow driving, while potentially associated with intoxication, is less specific and can result from many non-impairment factors. Thus, the smell of alcohol is the most consistent and actionable sign for indicating possible DUI.