A lot of the reason is due in part to having new suppliers, a lot of people in non-legalized states are now getting weed from Colorado/Oregon as opposed to Mexi

A lot of the reason is due in part to having new suppliers, a lot of people in non-legalized states are now getting weed from Colorado/Oregon as opposed to Mexico. If you casually browse /r/darknetmarkets and/or /r/worldnews you'll see that the USPS are starting to scrutinize outbound packages from weed legal states for more heavily as of recent.