I highly doubt you'll end up on a watch list just because your bag set off the ETD. It's a fairly common occurrence, like the TSA guy told you a lot of harmless items will set them off. It's just procedure that we take your info down in case something does go wrong. Of course to appease the more paranoid i'm just a grunt and they don't tell me ewverything.

But still, I doubt your name will end up anywhere worse than all the consumer databases that companies use to track your buying habits.