What could be an indication of substance abuse on the job?

Regularly showing up hungover can be a clear indication of substance abuse on the job. When an individual is hungover, it typically reflects a prior night of drinking or substance use that directly affects their ability to perform work duties effectively. Symptoms associated with being hungover, such as fatigue, lack of focus, irritability, and physical discomfort, can significantly hinder a worker's performance, safety, and productivity on the job. This behavior can compromise not only the individual's functioning but also the overall work environment, making it a serious concern in many occupational settings.

In contrast, the other behaviors listed—occasional tardiness, frequent breaks, and staying late to complete tasks—might be influenced by various factors unrelated to substance use, such as personal issues, workload management, or fatigue from work demands rather than indicating substance abuse directly. Therefore, the behavior of arriving hungover stands out as a specific and concerning sign of possible substance abuse.