National Forensic Laboratory Information System: 2011 Annual Report
U.S. Dept of Justice; Drug Enforcement Administration
Office of Diversion Control; November 2012
Download the report here
An estimated 1,660,216 drug reports were submitted to State and local forensic laboratories in the United States from January 1 through December 31, 2011, and analyzed by March 31, 2012.
This is a decrease of 3% from the 1,713,360 drug reports identified during2010.
Cannabis/THC was the most frequently identified drug (536,630 reports) in 2011, followed bycocaine (333,645 reports), methamphetamine (160,960 reports), and heroin (119,765 reports).