knowing your grower would also help prevent this from happening. i still think you're getting your weed from the wrong people. also i dont really understand the economics of lacing pot. I dont really know the price of meth or anything but it seems like the extra weight it would add to a bag wouldn't justify the cost of the meth used....maybe not meth, i assume meth is relatively cheap? but heroin definitely....why would anyone add heroin to a bag of pot when they can sell the heroin seperately? it makes no sense.