. . . "When this procedure took place, any Changeling present in the room would convert back to its gelatinous state, making the Changeling detectable. In early 2372, the crew of Deep Space 9 used phaser sweeps to find Odo, who was helping them to train for a possible infiltration of the station by the Founders. (DS9: \"The Way of the Warrior\")"@en . "Phaser sweep"@en . "A phaser sweep was a procedure in which a phaser emitter emitted a phaser burst that covers an area of a room. The procedure was introduced across the entire Starfleet in 2372 as a method to detect and stop Changeling infiltrators. On a setting of three or four, the Changeling reverts to it's gelatinous state, making it detectable. (DS9 episodes: \"The Adversary\", \"The Way of the Warrior\", \"Homefront\", \"Paradise Lost\") Aboard Federation starship's, all cargo and baggage brought aboard were to be subjected to phaser sweeps. (TNG eBook: A Sea of Troubles)"@en . . . "When this procedure took place, any Changeling present in the room would convert back to its gelatinous state, making the Changeling detectable. In early 2372, the crew of Deep Space 9 used phaser sweeps to find Odo, who was helping them to train for a possible infiltration of the station by the Founders. (DS9: \"The Way of the Warrior\") This procedure was used again later that year when a Dominion infiltration of Changelings was thought to have occurred on Earth. These phaser sweep devices were implemented in all Starfleet and Federation installations on Earth under orders from Captain Sisko, who was temporarily promoted to head of Starfleet security. (DS9: \"Homefront\", \"Paradise Lost\")"@en . . . "A phaser sweep was a procedure in which a phaser emitter emitted a phaser burst that covers an area of a room. The procedure was introduced across the entire Starfleet in 2372 as a method to detect and stop Changeling infiltrators. On a setting of three or four, the Changeling reverts to it's gelatinous state, making it detectable. (DS9 episodes: \"The Adversary\", \"The Way of the Warrior\", \"Homefront\", \"Paradise Lost\") Aboard Federation starship's, all cargo and baggage brought aboard were to be subjected to phaser sweeps. (TNG eBook: A Sea of Troubles)"@en . .