Which of the following is NOT a primary function of a K9 unit?

The primary function of a K9 unit typically revolves around specific task areas where canine capabilities excel, such as scent detection and search operations. In this context, monitoring traffic violations does not align with the main abilities of a K9 unit, as traffic enforcement relies more on visual observation, patrol techniques, and human judgment. K9 teams are trained for specialized roles, particularly in areas like searching for missing persons, detecting explosives, and finding illegal drugs, where their acute sense of smell can be utilized effectively.

In contrast, searching for missing persons leverages a K9's tracking ability and strong sense of smell. Detecting explosives is another crucial function where K9s are specifically trained to alert handlers to the presence of explosives. Similarly, finding illegal drugs is a key specialty of K9 units, as they can identify various substances rapidly through scent, contributing significantly to law enforcement efforts.