Lep, my brother works for the IL state police (sort of an administrative intelligence person, he's not sworn but damned close to it). He says that when they raid meth labs they're careful not to blow themselves up because of the chemical fumes or inhale the anhydrous ammonia, but raiding a pot patch...yech! They first send in a team who trained on Vietnam boobytraps, since they have found: punji sticks, claymore mines (both the real thing and improvised ones), trip-wired shotguns, homemade land mines, guards with automatic weapons, dogs which have been trained to crotch-bite and whose bark appartatus has been surgically removed, and other such fun things. The first team usually goes in at night and moves about a hundred yards in 4 hours, clearing as they go. Down in KY's Daniel Boone National Forest I understand it's a lot worse.

Grow it at home, in your greenhouse -- fine. Those who grow it for a living are just plain dangerous -- for one thing, they don't always clean up the nasty stuff when they move.