Which of the following is a key piece of equipment commonly used by PSOs?

Metal detectors are indeed a key piece of equipment commonly used by Protective Security Officers (PSOs). Their primary function is to enhance security by detecting metal objects that may pose a threat, such as weapons or contraband. In environments where PSOs are tasked with ensuring the safety of federal buildings and personnel, the ability to screen individuals and belongings for potentially dangerous items is crucial. This capability is vital for preventing security breaches and maintaining a safe environment.

While fire extinguishers, first aid kits, and flashlights are undoubtedly important tools in various safety and emergency situations, they do not specifically serve the same direct purpose related to security screening as metal detectors do. Fire extinguishers are primarily for fire emergencies, first aid kits are used for medical emergencies, and flashlights are essential for visibility in low-light conditions but do not relate directly to security measures designed to detect threats. Thus, metal detectors stand out as a specialized tool that directly supports the mission of PSOs in maintaining security and safety.