The most frequent signs of impairment that are looked for during a sobriety checkpoint stop are:
- the odor of alcoholic beverages or drugs
- bloodshot eyes
- the presence of alcoholic containers or drug paraphernalia in the vehicle
- slurred or difficult speech
- fumbling or other physical signs of intoxication
- admission of drug or alcohol use
- inconsistent responses to answers
- detection of alcohol by a passive alcohol-screening tool
