I knew a kid who had powder residue on his coat when he was going through OHare. They did a freakin cavity search, this guy was like 14 and with his family.
Sorry, I don't buy it. For one, even if an alert is raised after a residue test, they don't automatically take you in a back room and strip you down. They'll pull you aside, and start questioning you. Then, if need be, they will take the search further. But for a simple alert, a strip search is just not gonna happen. If the residue was on his coat, they'd be able to see that (the test strip wouldn't react when used to test other areas of clothing/baggage). They'd have no grounds to take the situation that far.
Also, the kid was 14. You're gonna tell me that his parents just let him be pulled out of line, taken to a back room, stripped and cavity searched? Nope. Sorry.
Any reasonable individual,
especially a parent, is not gonna let that happen without a fight. And if the kid was searched anyway despite the parent's objections and nothing ended up being found on the kid - why wasn't there news coverage of the event? You can't tell me that after all that, a simple "oops, we're sorry for the inconvienience little shaver" is gonna make everybody forget about it and shake hands. They'd be on the evening news faster than you can say "frequent flier miles".