Reading over the NC laws, in 14-421 it says that animals used for education for a public or private institution are exempt, and above it does not say which species, but uses the term venomous. Also talks about "unsafe" contact with other humans, and nowhere is there any more detailed wording, so technically (as in what I would go with) it does not say you can't use a snake of a venomous species that is no longer venomous. I don't know about the local laws of the area though.
Edit: The restrictions on native species are for keeping them in permanent housing inside the state, doesn't really have much to do with out of town folk.