Maybe they watched How High 1 too many times and thought they could smoke a dead dude and and got the bright idea to smoke out of a dead dude.

("I can't smoke finger")lol

Naw but on a serious note, that's some really sick sh*t.
I'm wondering if it had to do with some kind of Satanism or something. What the hell is this world coming to? I'd seriously haunt them and scare the sh*t outta these guys if that was my head they used:chainsaw:. N E how, what charges would these guys face if found guilty?