[Harmless Teddy Bear]

I've been stopped for "trace elements" so I would suspect that any amount that would bring down a plane would be more then enough to alert the dogs no matter where you stuck it.

[U S Army EOD]

I was escorting some classified material one time way back when and was armed. I rode the baggage cart from aircraft to aircraft and climbed aboard. I tried to surrender my pistol to the crew, as soon as I reached in and pulled it to give it to them, they had their hands up before I could explain what was going on. The rest of that flight I had coffee, tea, and food constantly spilled on me. They had no sense of humor.