It depends upon the agencies involved. The crack house around the corner is within the purview of local narcs and DEA. Apparently the local police in your area have not dedicated resources to the problem for any number of possible reasons.
AAS through the mail involves Customs (the newly created "BICE" under DHS, Bureau of Immigartion and Customs Enforcement), and USPIS (Postal Inspection Service). Apparently postal inspectors have been living up to their reputation and been very diligent. As an aside, USPIS is one of the nation's oldest law enforcement agencies, having been founded by Ben Franklin. I understand that their training is first rate and they have a crime lab that is second to none. In any event, in addition to child pornography and credit card fraud, they have enough resources to pursue simple personal use amount juice cases as well.
RW