This post is a step-by-step guide to deal with companies and sellers etc who sell misbranded drugs and cosmetics.
Your friend just purchased a packet of weed from a peddler. On the way back to his place, two beat constables suddenly pop out of nowhere and nab your friend. They confront your friend about the weed and frisk him. Your friend complies and the packet is found in the back pocket of his jeans. We know the rest of the drill. They extort some money and let him go