What is a key sign of someone being impaired by drugs or alcohol?

Erratic driving behavior is a key sign of someone being impaired by drugs or alcohol. This behavior can manifest as swerving, sudden stops, excessive speed, or difficulty maintaining lane position. Impairment alters a person’s judgment, motor skills, and reaction times, leading to unsafe driving patterns that can put the driver and others on the road at serious risk.

The other options, while they may occur in various situations, do not consistently indicate impairment. Excessive laughter and talking excessively can happen for a range of reasons, including excitement or social interaction that is not necessarily linked to drug or alcohol use. Calm and stable movements are typically indicative of sobriety and control, making it less likely for someone to be impaired in those circumstances.