There is an interesting document floating around various email lists entitled Mapping for Community-Based Prisoner Reentry Efforts: A Guidebook for Law Enforcement Agencies and Their Partners.  The guidebook makes the case for data collaboration between law enforcement and corrections to increase the liklihood of public safety and successful reentry.  The following is an excerpt from the guidebook: 

"This guidebook aims to:

• Explain how public safety can be enhanced by police involvement in prisoner reentry efforts;
• Describe the value of mapping prisoner reentry in support of such efforts; and
• Guide readers through the steps necessary to obtain, map, and analyze reentry-related data in the interest of informing police/community prisoner reentry partnerships.

This guidebook raises and answers a series of questions designed to walk the reader through the logic of why and how police can take an active role in prisoner reentry efforts and how mapping can aid in those efforts. It then describes in detail the reasons behind, and strategies for, engaging in data-sharing partnerships with corrections agencies, followed by a description of useful maps that can be produced. Special attention is paid to describing the various obstacles both to forging reentry partnerships and to mapping reentry data and how those obstacles can be surmounted. The guidebook closes with a discussion of how police agencies, in partnership with corrections, service providers, and community representatives, can use maps to influence changes in policies, practices, and procedures to better enhance public safety by reducing recidivism among released prisoners and apprehending those who do recidivate swiftly and efficiently."