"The 2013 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 [Drug Enforcement Administration] intelligence analysts 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 smuggling and transportation trends, and indicators of changes in smuggling and transportation methods). The 2013 NDTA factors in information provided by 1,307 state and local law enforcement agencies through the 2013 National Drug Threat Survey (NDTS). NDTS data used in this report do not imply that there is only one drug threat per state or region or that only one drug is available per state or region. A percentage given for a state or region represents the proportion of state and local law enforcement agencies in that state or region that identified a particular drug as their greatest threat or as available at low, moderate, or high levels."
DEA-NWW-DIR-017-13; Drug Enforcement Administration-NWW-DIR-017-13
U.S. Department of Justice: http://www.justice.gov/