"This quick reference guide provides common warning signs of gang involvement, but may not be all-encompassing. Parents should look for multiple signs to indicate possible gang involvement because some of these indicators alone, such as clothes or musical preferences, are also common among youth not involved in gangs. Parents are encouraged to familiarize themselves with local gang symbols, seek help early, and consider contacting school personnel, local law enforcement, faith leaders, and community organizations for additional assistance."
United States. Dept. of Justice. Office of Community Oriented Policing Services: http://cops.usdoj.gov/