Which of the following is a potential sign of substance impairment in the workplace?

Wearing long-sleeved shirts can be a potential sign of substance impairment in the workplace, particularly if an individual is trying to conceal physical signs associated with substance use, such as track marks from injections or bruising resulting from alcohol abuse. This behavior might indicate a desire to hide symptoms that could otherwise raise concerns among coworkers or supervisors regarding the individual's health and wellbeing.

By contrast, options like positive work reviews, consistently punctual attendance, and high employee morale generally reflect positive behaviors and performance in the workplace, which are less likely to indicate impairment. Signs of impairment typically relate to noticeable changes in behavior, appearance, or performance rather than indicators of success or stability. Therefore, wearing long sleeves can be interpreted as a behavioral cue that suggests the need for further observation or inquiry into an individual's condition.