QUestion about venemous snakes, and new data.

[wolfwing]

I read that some new data actually shows virtually all snakes are venemous, but their potency is too low to effect humans due to dilution in saliva and weakness to inject with none hollow fangs. In fact the living relatives of the ancestors of snakes have the same venom themselves. I can post Data on this if allowed, but not sure on restrictions, though curious how much new stuff has come about this the data I've read is a few years old from 2005, found this looking up evolution of snake venom.

My question is, have they actually compiled a list of what snakes have venom or not? I can see constrictors losing the venom as they don't nescarily need it, but wondering if anyone has actually tested enough snakes and such.