Here's where it's written in law. This would be a final draft of regulations promulgated in 2009.

http://www.ncleg.net/Sessions/2009/Bills/Senate/PDF/S307v4.pdf

Venomous snakes are not illegal to posses, barter or sell in North Carolina. The catch is, you cannot transfer or sell one to someone else unless you also sell the locked enclosure with it. Deli cups or snake bags automatically break the law. This is why you don't see venomous sales at reptile expos.