No police powers
Observe, document, escalate.
A trained observer with the same legal authority as anyone else on the street.
The most dangerous thing in private security is a company that lets clients or officers believe the uniform carries authority it does not. There is no power of arrest beyond that of any citizen, no power to search, and no law enforcement status. An officer who acts otherwise creates liability for everyone, starting with themselves.
What the role does provide is real: visible deterrence, a trained person watching for the things that precede an incident, documentation that stands up afterwards, and the judgement to call law enforcement at the right moment rather than the wrong one.
Patrols deserve one further point. A patrol nobody can verify is an invoice, not a service. Electronic checkpoints timestamp each visit and put the evidence in the client's hands, which is also what makes varying the timing worthwhile — a predictable patrol is simply a schedule for whoever is watching the site.
Observe, document, escalate.
Timestamped, or it is just a claim.
Officers work to them, not around them.
Free, with an honest view of what cover the site actually needs.