Little Billy asks 'Why does my leg feel tingly?'

Well Billy, it's possibly because you're a traitor to your species and have decided to import foreign reptiles into the country via one of your prosthetic limbs. So, really, it's more your nub that itches more than your actual leg ... because your leg isn't actually there.

PROTIP: The appropriate response when approached by authorities should've been "Wait, you think I have what in m--OH MY GOD! AAAAH!" Then he would've gotten away free as a bird.