Which sign is commonly associated with narcotic use?

Pupil constriction, also known as miosis, is a classic sign associated with narcotic use. Narcotics, or opioids, typically depress the central nervous system, leading to various physiological effects. One of these effects is the constriction of the pupils, which is a distinguishing characteristic that can help law enforcement or medical professionals identify potential substance use.

Contrastingly, increased energy would more likely be associated with stimulants rather than narcotics, as these substances tend to ramp up activity rather than sedate it. A flushed complexion is often seen in other contexts, such as with alcohol or certain stimulants. Erratic behavior, while a possible indicator of various substance use, does not specifically point to narcotics, as these drugs generally produce more subdued behavior due to their depressant effects. Hence, pupil constriction stands out as a definitive and commonly recognized sign of narcotic use.