Weapon detector
From Memory Alpha, the free Star Trek reference.
The weapon detectors were sensors built into the airlocks on station Deep Space 9, capable of detecting military technology carried by persons boarding the station from docked starships.
The station's first visitor from the Gamma Quadrant, a member of the Tosk species, was alarmed when a phaser being worn by Chief Miles O'Brien activated the weapon detectors in one of the airlocks in 2369. O'Brien later rigged the weapon detectors to stun a Hunter who was pursuing the Tosk. (DS9: "Captive Pursuit")
Later the same year Neela, a Bajoran member of the station's engineering crew, disabled the weapon detectors so that she could take a phaser onto the Promenade and stage a failed attempt to assassinate Vedek Bareil Antos. (DS9: "In the Hands of the Prophets")
