yeah, IMO meth laced weed is just a government propaganda myth, don't even worry about it. I DO recommend, however, that if that shit fucked you up that much with one little hit, don't smoke it like you would less potent weed, cause you will likely have a pretty shitty high, and that would be a waste of weed if it's that good... and I think that guy knew he was ripping people off with the shitty bags, so when you called him on it he might have realized that it would be smartest just to sell straight to you. That happens a lot with the high school dealers around here...