The short answer
Private security is a contracted protective service for a defined property, organization, event, or set of duties. Police serve the broader public, enforce criminal law, investigate crimes, and exercise governmental authority within their jurisdiction. A private security officer focuses on the client’s lawful objectives—such as access control, patrol, observation, policy enforcement, hazard reporting, incident documentation, and contacting emergency services.
What to know
The legal distinction matters. Arizona law states that employment as a security guard or armed security guard does not give a person the authority of a commissioned police or peace officer; guard duties are performed in the capacity of a private citizen. A uniform, badge, guard card, or firearm does not change that rule. Post orders should therefore define when the officer observes and reports, asks someone to comply with property rules, contacts management, or calls law enforcement.
Private security and police are complementary, not interchangeable. An on-site guard can maintain a continuous presence, learn normal property activity, document conditions, and report a developing issue. Police retain responsibility for law-enforcement actions and emergency response. A well-designed security program supplies officers with accurate addresses, access instructions, emergency contacts, evidence-preservation procedures, and a clear handoff process so they can communicate efficiently with police, fire, or medical responders.