A place at the perimeter
of a secured area
where security personnel
attempt to ensure that anyone or anything entering the area meets with its security policy
. For example, in international airports
around the world, the area where passengers
has a policy requiring no guns
be carried except by authorized persons.
In the United States, these are popping up more and more in places like courthouses, concert halls and schools because a perceived increase in the threat of armed violence has led to more formal security policy being adopted in such places.