I'm really thinking false positive -- either that or total wingnut.
A colleague told me yesterday that airport tests of his laptop computer have turned up three false positives over the years.
Only they weren't exactly false
positives... When this happens, security people naturally confiscate your boarding pass, frog-march you over to a locked room, and ask you a lot of questions from a list. The last question is "have you had any recent contact with anyone who uses this-or-that heart medication?"
His answer each time has been "yes." His mother has a heart condition, and has a quick-acting spray which contains... yes, nitroglycerin. It transfers readily to her clothes, and if he then gives her a hug, and later uses his laptop... the rest you know. Weird, but true.