Alcohol consumption among youth has become a pervasive problem in Indian communities across the Nation. It is imperative that tribal communities enlist the help of other law enforcement and service and treatment agencies to help combat the problem of underage drinking. The handbook describes the jurisdiction issues and Federal laws governing criminal justice authority over crimes committed in Indian country. Law enforcement efforts in tribal communities differ; some tribes that have their own tribal police while other tribal communities fall under the authority of State or county law enforcement agencies. Direct law enforcement responses to the problem of underage drinking in tribal communities include the use of specialty patrols and compliance checks. Cooperation with off-reservation law enforcement agencies is necessary to stop problems such as off-reservation points of sale to minors. Cross-Deputization is described as a procedure in which off-reservation officers are granted authority to enforce laws in tribal communities and vice versa, aiding in the effectiveness of the collaboration. The handbook describes the value of collaborations and offers a framework for achieving a successful partnership with another agency. Finally, the benefits of community policing are discussed and successful community programs are described that help officers integrate themselves into the local community.