Which of the following is a sign that may indicate illegal drug activity?

Frequent visitors at odd hours can indeed be a sign that may indicate illegal drug activity. This behavior is often associated with drug dealing, where individuals may arrive at a location for a brief period, conducting transactions discreetly during late-night hours or when it is less likely to attract attention. Such activity can create patterns that make it suspicious, as it deviates from normal residential behavior, where visitors tend to come during typical daytime hours or for more extended periods. Recognizing this pattern is essential for patrol officers who are trained to identify potential drug-related issues in their communities.

In contrast, excessive traffic light compliance, commonly accepted public gatherings, and routine maintenance of properties do not typically suggest any illegal activity. Compliance with traffic signals often indicates responsible behavior and adherence to the law, while public gatherings can occur for many legitimate reasons, such as social events or community meetings. Routine property maintenance reflects a homeowner's responsibility in caring for their surroundings and is not an indicator of criminal activity.