The Maricopa County Attorney is dedicated to the vigorous prosecution of those who commit crimes within the county. As the chief advocate for the State and the citizens of the community in criminal matters, the County Attorney seeks to provide the highest quality service and maintain the integrity of the criminal justice system. Criminals must be held accountable, while assuring that the statutory rights and emotional needs of victims and witnesses are properly addressed. Additionally, the County Attorney seeks to implement, promote and participate in programs that reduce crime and enhance the quality of community life. The County Attorney also contributes to excellence in local government by providing complete legal services to the county, its officers and various political subdivisions.

The purpose of this report is to use data from a sample of recently booked arrestees in Maricopa County to examine the scope and nature of Maricopa County’s gang problem. In particular, this report supplements data presented in the bi-annual report on gangs conducted by the Arizona Criminal Justice Commission, which relies on official police data and their occasional white paper on gangs that relies on self-report data from school youth. We organized our analyses around six research questions: (1) what proportion of adult arrestees are involved in a gang, and what are the socio-demographic differences between those who are associated with a gang and those who are not; (2) what are the rituals associated with gang joining; (3) how do gang and non-gang arrestees differ in their experiences with crime, drug use and victimization; (4) what is the organizational structure and composition of gangs; (5) how do members socially identify with their gang; and (6) how and why do members leave their gang?