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

The responsibility of conducting criminal investigations typically falls under the jurisdiction of law enforcement agencies rather than security guards. Security guards are primarily tasked with maintaining safety and order within a specific area, but they do not have the authority or training to carry out formal investigations into criminal activity. Their focus is on preventative measures and responding to incidents, rather than conducting in-depth inquiries into crimes, which require specialized skills and legal authority.

In contrast, patrolling assigned areas, monitoring CCTV footage, and enforcing property rules are all standard duties of a security guard. These activities are essential for identifying potential security issues, responding to incidents, and ensuring that the property rules are upheld to maintain a safe environment.