Talk politics.

Come now, most people wouldn't be able to answer this because most people are not experts on the nature, properties and detection of explosives. The only methods you and I could know for sure are possible are this type, the ones that focus on ways people can hide them on their person and not what they are. Demand an alternative from an expert by all means, but I don't think it's going to make much of a point if you can't get one from a bunch of people on LJ.