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IMMOBILIZING FOAM

This rapidly-expanding foam is considered a premier nonlethal pacification option. A single canister can paint a hallway with thick yellow foam, which then condenses and hardens solid, immobilizing anyone caught in the radius. Sufficient force will break the foam, but after about a minute it begins to dissolve on its own- Enough time for a tactical maneuver, but not enough time to suffocate those trapped.