"The 2014 National Drug Threat Assessment (NDTA) Summary addresses emerging developments related to the trafficking and use of primary illicit substances of abuse and the nonmedical use of controlled prescription drugs (CPDs). In the preparation of this report, DEA considered quantitative data from various sources (seizures, investigations, arrests, drug purity or potency, and drug prices; law enforcement surveys; laboratory analyses; and interagency production and cultivation estimates) and qualitative information (subjective views of individual agencies on drug availability, information on the involvement of organized criminal groups, information on smuggling and transportation trends, and indicators of changes in smuggling and transportation methods)."
Report No. DEA-DCT-DIR-002-15
U.S. Drug Enforcement Administration: http://www.dea.gov/