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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.The 2011 NGTA enhances and builds on the gang-related trends and criminal threats identified in the 2009 assessment.It supports US Department of Justice strategic objectives 2.2 (to reduce the threat, incidence, and prevalence of violent crime) and 2.4 (to reduce the threat, trafficking, use, and related violence of illegal drugs).The estimates were provided on a voluntary basis and may include estimates of gang members as well as gang associates.Likewise, these estimates may not capture gang membership in jurisdictions that may have underreported or that declined to report.In calculating the number of street and outlaw motorcycle gang members, respondents in each region were asked to select from a series of ranges of numbers.The median numbers of each range were aggregated to generate an estimate for the total number of gang members.

In previous iterations of the NDTS, survey responses were validated through targeted outreach to jurisdictions.

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.

Based on these estimates, geospatial maps were prepared to visually display the reporting jurisdictions.

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.

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