What is a typical indicator of cannabis use?

Redness of eyes is a well-known indicator of cannabis use due to the chemical compounds found in the plant, particularly tetrahydrocannabinol (THC). THC has the physiological effect of dilating blood vessels, including those in the eyes, which can lead to noticeable redness or bloodshot appearance. This symptom is often one of the more visible and easily identified signs of recent cannabis consumption, making it a common indicator for law enforcement and those observing potential substance use.

Other options, while they may be associated with substance use in general, are not specifically indicative of cannabis. For instance, increased anxiety may arise from various substances or conditions, not solely cannabis. Similarly, pupil size contraction is more closely linked to opioids and certain other drugs, while an agitated appearance can occur with numerous different substances or medical conditions, making them less definitive as indicators of cannabis use specifically.