Build in 2 flashdrives - don't lick your fingers, you see the regular drive with innocuous crap. Lick, and you see the real deal. Better, have a magnetic key or

Build in 2 flashdrives - don't lick your fingers, you see the regular drive with innocuous crap. Lick, and you see the real deal. Better, have a magnetic key or transponder that unlocks the real drive (and hides the innocuous one.) Doesn't draw the attention that a mysteriously not working drive does.