The short answer
A professional security contract should have a written call-out and missed-shift procedure. When an officer reports an absence, the company should promptly notify scheduling or supervision, seek a qualified relief officer, and keep the client informed when coverage may be affected. The replacement must have the required license, armed status, assignment qualifications, and access to current post orders; filling the post with an unprepared person can create a different problem.
What to know
The client and provider should decide in advance what happens if relief is delayed. Options may include extending an existing officer within lawful and safe limits, deploying a supervisor, modifying noncritical patrols, or using another agreed temporary control. None should be assumed unless authorized. A missed shift also needs escalation, documentation, root-cause review, and corrective action—not merely a billing adjustment.
Ask the contract to state who is notified, by what method, how soon notification occurs, how relief is approved, what counts as a service failure, and whether credits or other remedies apply. For critical 24/7 posts, confirm relief coverage for breaks as well as absences and verify how overtime fatigue is managed. Arrow advertises 24-hour on-call assistance and flexible scheduling, but its public site does not describe a guaranteed replacement time. Any promise should be specific, realistic, and contractual.