[gesman]

Failed TSA agents would reply - "...ohh but we saw that these were only simulated explosives and we let them through as they didn't pose any danger!"

[dsl]

I have worked with simulated explosives in the past for training. They are designed to be nearly indistinguishable from the real thing, and have trace amounts of material that will cause detectors and trained dogs to trigger.

Literally the only thing that saves you from going to super jail when working with these types of objects is a signed letter of authorization.