TSA officials would not detail what kind of explosives can be detected. But, they say it's possible a traveler who's been to a gun range or even handled certain medications could be detained. "You can be assured that person will receive additional security scrutiny," says Koshetz. TSA officials say they don't expect the swabbing to delay lines or increase travel times for passengers. The entire process usually takes less than a minute and can be accomplished while people are already standing in line at a security checkpoint.