These guys know exactly what they're doing. They're not only selling the ten bottles of cold medicine to one guy for his meth, but they got the Chore Boy copper mesh pads and the glass pipes with the rose right under the counter for those discriminating customers who still prefer crack.
What's your proof they know? Clerks should stock whatever items sell well. National Enquirers and packs of Big Red gum are also right next to the register as well. Are those used for making meth too?
My former officemate had such a resistance build up to pseudoephedrine, he required massive doses. I hope he (or his local merchant) hasn't been thrown into prison for his medical/pharmaceutical needs!
BTTT