Just to split hairs a bit, it's probably worth commenting on the distinction between being arrested for possession of hemp, vs. being successfully prosecuted for same.
As noted, many juristictions make no distinction between narcotic cannabis and non-narcotic hemp. But even if they did, could a law enforcement officer distinguish one from the other if he were to discover, say, a 100 pound bale in the back of my car? Even if I could, eventually, prove that the material was of the non-narcotic variety, and that I needed it to support my 30-yard-a-day rope-making habit, I really doubt the officer would take my word for it and let me off with a warning!
