Which of the following is an indicator of narcotic use?

Pinpoint pupils are a classic and well-recognized indicator of narcotic use, particularly with opioids. When someone uses narcotics, these substances typically lead to a specific physiological response, including miosis, which is the constriction of the pupils. This reaction occurs due to the impact of narcotics on the central nervous system and the way these substances interact with certain receptors in the brain. Unlike other behavioral or physical signs, pinpoint pupils provide a reliable and objective measure that can signal narcotic use, making it an important indicator for law enforcement and medical professionals when assessing individuals suspected of drug use.

In contrast, restlessness may be more associated with stimulant use rather than narcotics, increased energy levels are typically indicative of stimulants, and aggressive behavior can arise from a range of substances but is not characteristic of narcotic use. These differences highlight the significance of pinpoint pupils as a distinctive sign closely aligned with narcotic consumption.