Which of the following is NOT a responsibility of a security guard?

A security guard's primary responsibilities revolve around the safety and security of their designated area, which includes tasks such as preventing unauthorized access, conducting regular patrols, and monitoring surveillance equipment.

Supporting criminal investigations as a detective is not within the typical scope of duties for a security guard. Security guards are generally not trained or authorized to conduct investigations or perform detective work, which often requires specialized training, knowledge of legal procedures, and law enforcement authority. Their role is more focused on maintaining a secure environment, identifying and reporting incidents, and acting as a deterrent to criminal activity, rather than delving into the investigative aspects of crime.

Thus, the task of supporting criminal investigations is outside the typical responsibilities expected of a security guard.