The Transportation Security Administration (TSA), the US agency responsible for security in all modes of transportation, will soon start swabbing air passengers' hands randomly at airports to look for traces of explosives in an attempt to check terrorists from boarding planes.
According to Greg Soule, a spokesman for TSA, the tests may take place anywhere at the airport - it could be at the security check point, at the check point itself, or right after it.
Earlier, airport screeners swabbed carry-on luggages and other objects. This enhancement in security check-up is the outcome of the failed attempt to blow up Northwest Flight 253 over Detroit on Christmas Day.
Umar Farouk Abdulmutallab, a Nigerian man, tried to ignite a bomb sewn into his underwear as his international flight neared Detroit. He was subdued by passengers.
The agency has more than 7,000 explosive trace detection (ETD) machines and has purchased 400 additional units worth $16 million.