I feel something is being missed, but I will preface by saying I buy all my rodents from rodent pro. Now when I was feeding live to dome of my snakes I saw them snap rodents necks, mind you that was rare. However it can't be overlooked that in cases of constriction that the heart can actually explode. I would imagine that is a lot worse than asphyxiation, the real point is killing in itself is in humane. So really all the arguments here are kinda pointless, just my .02 on the subject.
Sent from my snake room