From
http://forum.kingsnake.com/CITES/messages/48.html.
CITES I animals are considered endangered and cannot be imported, exported, or cross state lines without proper permits. If you are finding CITES I animals in a store, you might consider calling US Fish and Wildlife to see if the store has the proper permits.
I don't know for sure if occidentalis is CITES I, but I'm fairly certain I've heard so. You have information direct from their website and it says nothing about interstate travel, so I don't know what to think. *Shrugs*