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Some have suggested that the human alarm pheromone could lead to chemical fear-sensors. The project Integrated System for Emotional State Recognition for the Enhancement of Human Performance and Detection of Criminal Intent (do they call it ISESREHPDCI for short?) specifically mentions the possibility of monitoring pheromone levels:
"Such systems could be used to assess fitness for duty, integrated into closed loop systems regulating user vigilance and workload, or used to detect the sinister intent of individuals and prompt pre-emptive interdictions. These systems could unobtrusively monitor individuals within military operational environments or crowded civilian settings by relying on passive detection."
But what about offensive use? Pheromones are effective in minute quantities, so a wide area can be blanketed with just a few liters. Given sufficient concentration, would everyone exposed start suffering from an unidentifiable dread? The contagious aspect means that those affected would start churning out fear pheromone as well.