Comment by walrus01
18 hours ago
These things are also notoriously prone to false negatives. I know a person who uses the same laptop briefcase to take their handgun to the local indoor shooting range, with magazines and ammo, and also uses that bag as a carry on for travel.
The bag goes right next to the shooting bench at the firing line. It presumably gets a decent amount of powder residue on it, and yet it's been swabbed several times and not set off anything. My buddy is scrupulously careful to remove anything non-airport-approved before taking it on a trip, so the fact that something "bad" was previously contained in the bag has been double/triple checked to be absent before they show up to the airport.
Heard similar stories from many people. I have my own--
I was at a range shooting this old revolver with worn seals. Every shot, unburnt (or sometimes burning) powder was flying backward onto my face and arms. I basically took a gunpowder shower.
Got up like 6 hours later and went to the airport to get on a plane. Got swabbed. Came back negative. Got on the plane.
So... yeah, not really sure what the swabs are doing. I have to assume it's more an issue of "they're not intending to detect that" than "failures to detect" because otherwise the repeated misses here are just a little too big to believe.
Most likely there is no quality control for the security process so no one has noticed that the swabs aren't working properly. Most such processes do not have any QA or QC as far as I can tell and the people actually doing the work have no interest in the effectiveness of the process or influence over it.