Tailgating– describes the behaviour of one person directly following another through security gate. This is typically a problem with swipe-card access-controlled doors, where one person swipes his card, and another follows.  An electronic tailgate monitor can instigate a tailgate alarm when two people try to pass through a security gate simultaneously. The Irisys Thermal counter can be deployed as tailgate detection system and can be integrated with building security systems to ensure that even when security staff are distracted, non-accredited visitors cannot pass into secure areas without detection.