Which of the following is a physiological sign that may indicate cannabis influence?

The presence of bloodshot eyes is a well-documented physiological sign that may indicate cannabis influence. When cannabis is consumed, the active ingredient THC (tetrahydrocannabinol) causes blood vessels to expand, leading to increased blood flow to the eyes and resulting in a reddened appearance. This effect is often one of the more noticeable signs that someone has used cannabis, making it a key indicator during assessments.

In contrast, stable heart rate, increased perspiration, and improved balance do not typically correlate with cannabis influence in the same way. While physiological responses can vary among individuals, bloodshot eyes are consistently associated with cannabis use, making it a reliable sign for identification.