One of the first innovations especially made for security reasons in the late 20th century, where the terrorist act was limited to metal weapons (knives, guns, etc...).

 

A walk through metal detector is used at the access points of any place, it’s meant to detect only metals but it doesn’t detect just the weapons and here come the roles of the person working at the checkpoint and this is our work to teach him how to make the search how to work on the unit and above it how to control the situation.