Establish "post orders" such as no smoking, sleeping, TV, clean uniform and attitude to outline your expectation from security guards. Require security guards to keep a detailed log of their activities. For example, log entries like "3:30 a.m. nothing to report", "but "4:00 a.m. walked north perimeter to investigate noise; nothing found." Establish patrol routes and times that you want covered by the security firm's services. Don't make the area for drive-through patrols too broad or the security guards will drive too fast in order to cover the whole area.
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