At a time of growing insecurity related to terrorism, it is increasingly common to put in place control procedures for people and goods through inspection devices at the entrance of buildings and structures that are usually very busy and can be targeted by acts of terrorism.

In order to avoid and limit malicious acts, inspection devices are placed at the entrances of the buildings to control people, their bags and luggage, and limit access to people who do not represent any threat.

Various means are put in place so as not to let through dangerous objects like weapons, explosives knifes and blunt objects. These devices usually include metal detection gates, handheld metal detectors, x-ray scanner, explosive detectors, face detection systems, etc.