There are many "rear-fanged" snakes that prey primarily on cold-blooded species in the US that technically use a mild venom but are considered harmless to humans.
I've never heard even of any anecdotal reports of any of those giving any permanent effects, but a very few people have reported allergic reactions that feel like a bee-sting and one or two instances of marked swelling that went away without treatment.
Among these are ringnecks, hognose, etc etc, and lyre snakes which are mostly in the southwest- lyre snakes BTW in the literature are supposed to be nervous in character and ready to bite...
There are relatively few US "non-pit vipers" with vertical slit pupils, but there are some native harmless snakes with them: rubber boas, night snakes, lyre snakes, plus escapes like burmese pythons in Florida, etc.
So I didn't try to give a complex description that includes all, but only, venomous snakes; I gave a simple description of a subset any person can be confident are harmless.
Golden rule- If you aren't sure what it is, don't bother it. We have it easy here in the USA, in many other parts of the world there are dozens of species of highly venomous snakes with no simple rules which are harmless and which are deadly- reverse natural selection, as people indescriminately kill ALL the snakes they can in many of those areas... just like many in the US %^ (
Hogs are great fun!
