Originally Posted by WillCAD

I'm certain that this is supposed to be explosives testing. But, according to those with more chemistry knowledge than me, there is no chemical test for explosives or the chemicals that make up explosives, which doesn't require the test articles to come into physical contact with the tested material. In other words, the Magic Strips (TM) they're currently waving over beverages to "test" are absolutely useless for that purpose.