Why do they check your wrists at the airport?

Why do they check your wrists at the airport? Why Does the TSA Swab Hands? The Transportation Security Administration randomly swabs passengers’ hands at security checkpoints and airport gates to test them for traces of explosives. The TSA swabs are analyzed for nitroglycerin, nitrates, glycerin, or other chemicals.

Why Does the TSA Swab Hands? The Transportation Security Administration randomly swabs passengers’ hands at security checkpoints and airport gates to test them for traces of explosives. The TSA swabs are analyzed for nitroglycerin, nitrates, glycerin, or other chemicals.