I know it's a stun gun, too.

The 48 Hours episode interviewed some old guy who is supposed to be an expert in firenzics (I know it's spelled wrong, but I'm blank). This guy said that he KNEW -- was 100% CERTAIN, that is was not from a stun-gun, yet NEVER said what it WAS from. Well, one he said was a button, but how does he explain the others? And how does he manage to poo-poo the fact that the distances between marks are exactly the same?