Which psychophysical indicator may be useful for recognizing cannabis influence?

Poor balance is a significant psychophysical indicator that can be useful for recognizing cannabis influence. Cannabis can impair coordination and motor skills due to its effects on the central nervous system. Individuals under the influence may struggle with maintaining their balance during physical tasks or activities, which can be evident in their movement, posture, and ability to walk straight. This impairment in balance can help law enforcement officers and others trained in recognizing drug influence assess whether someone may be affected by cannabis.

While lethargy, rapid heartbeat, and heightened appetite are associated with cannabis use, they may not be as immediately observable or indicative in a physical sense when assessing someone's ability to perform tasks requiring coordination. Lethargy mostly affects energy levels and may not visibly manifest in behavior, a rapid heartbeat is less commonly associated with cannabis compared to other substances, and heightened appetite is a psychological effect rather than a direct indicator of impairment. Therefore, the presence of poor balance provides a clear and observable sign of cannabis influence in a person.