Door Detective increases the security of any access-controlled door. With an access system approval, one person can pass through the doorway in the approved direction without alarm. Door Detective monitors how many people pass, and in which direction, for each valid authorization and sounds an alarm if there is a violation. A secondary relay can optionally activate stricter security actions such as triggering CCTV or locking other doors. By raising the access control’s security level, Door Detective better protects employees and valuable assets. It also maximizes the investment in the access control system. Door Detective should be considered in any area where an intruder could cause more than a few thousand dollars in damage.