The Transportation Security Administration is about to begin randomly swabbing the palms of airline passengers to check for traces of explosive chemicals.
The extra security check will start in the next two weeks at all commercial airports, including San Francisco, Oakland and San Jose.
The TSA will not screen every passenger and you will not see the detectors every day at every airport.
These are spot checks, in response to the attempted bombing of a Northwest Airlines flight on Christmas Day where a man had explosive chemicals in his underwear.
