There is now a new TSA screening process taking place at airports across the US. TSA screening agents are now roaming the airports and randomly (probably not random but profiled) swiping peoples hands to test for residual residue from explosives. These tests will also be done on bags as well.
This program was tested at 5 airports around the USA before being implemented nationwide. The current metal detectors can not spot materials such as powered explosives etc, so the TSA has reverted to using a chemical inspection with pre-treated swaps and wipes. Since the TSA agents are roaming around open areas of the airports these inspections are not expected to induce further delays at TSA check-in scanner points within the airports.
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