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The pheromonic sensor was a type of sensor commonly used on explosive devices. They were triggered when a particular individual or species came within range. Flaxian assassins were known to favor pheromonic sensors, so Elim Garak used a pheromonic sensor to trigger a bomb in his shop in 2371, thus implicating the Flaxian assassin Retaya. (DS9: "Improbable Cause")