A very common security risk occurs when an unauthorized person follows an approved person through a door. Oftentimes the approved person will hold the door for the intruder. This risk can be minimized in two ways: security training for users and the use of turnstiles.
The implementation of turnstiles offers many benefits to securing an area. The flow of people is limited to one direction, only one person at a time gains entrance, and people must enter single-file, giving security personnel a clear view of each person. Turnstiles eliminate the risk of unauthorized persons tailgating others to gain access and enable security personnel to efficiently isolate potential threats.