A few weeks ago there was a large bust in my area; 37 million dollars worth!!! Here is the link- http://www.goldrushcam.com/mariposa19.htm
I am about 10 minutes from the area. I bring this up because the people operating it had lookouts with guns...so obviously if a trespasser stumbled across it, they would get capped. This made it very obvious to me that the laws against pot cause violence, not pot itself. Would these people have guns if it weren't illegal? I doubt it...