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In calculating the number of street and outlaw motorcycle gangs, the low end of each range was aggregated to generate an estimate for the total number of gangs and gang members.
Prison gang member estimates were derived directly from the US Federal Bureau of Prisons (BOP) and state correctional institutions across the country.
These estimates do not affect the qualitative findings of the 2011 NGTA and were used primarily to create the maps highlighting gang activity nationally.
After further review of these estimates, the maps originally provided in 2011 NGTA were revised to show state-level representation of gang activity per capita and by law enforcement officers.
This information provided by our law enforcement partners was used to identify many of the trends and issues included in this report.
Reporting used to quantify the number of street and outlaw motorcycle gangs and gang members was primarily derived from the 2010 NDIC NDTS data and some supplemental NGIC reporting from our law enforcement partners.
The data used to calculate street gangs and outlaw motorcycle gang estimates nationwide in the report are derived primarily from NDIC’s National Drug Threat Survey.The assessment is based on federal, state, local, and tribal law enforcement and corrections agency intelligence, including information and data provided by the National Drug Intelligence Center (NDIC) and the National Gang Center.Additionally, this assessment is supplemented by information retrieved from open source documents and data collected through April 2011.The gang estimates presented in the 2011 National Gang Threat Assessment (NGTA) represent the collection of data provided by the National Drug Intelligence Center (NDIC) through the National Drug Threat Survey, Bureau of Prisons, State Correctional Facilities, and National Gang Intelligence Center (NGIC) law enforcement partners.An overview of how these numbers were collected is described within the Scope and Methodology Section of the NGTA.