The "Weapons Control System"

Interesting. Seen at Say Uncle:

The access control system consists of a bullet resistant aluminum frame enclosed by bullet resistant glass, and a bullet resistive ceiling. The frame is divided into two separate compartments: one for entry and one for exit. Passage through each compartment is controlled by a set of two intercommunicating doors. Entry doors and exit doors are totally separate systems. Control of the doors is achieved through the use of exit devices, magnetic locks, infrared sensors, and a metal detector.
NovaComm’s Access Control Vestibule can distinguish between magnetic, non-magnetic and mixed alloys weapons.

http://www.everydaynodaysoff.com/2010/10/09/weapons-control-systems-in-banks/