I think walking up on a lab in the middle of the woods may get the same reaction that myself and a friend got when we walked up on a monster of a moonshine still on federal land north of Macon, GA.
My friend wanted to get a closer look, I could smell the mash cooking and knew someone was in the area so I ran like a dog, he turned and was close on my heels. A few days later we read that they fired on law officers when the approached the still.
Booze and dope are both big business and could get you shot, Best advice, if you walk up one either a lab, garden plot or a still, then turn and get the heck out of there. Most of the folks engaged in this kind of activity are a little crazy anyway. Ain't worth dieing for.