Law Enforcement in the National Park Service: An Assessment of the Investigative Services Branch and Office of Professional Responsibility. Washington, DC: U.S. Department of Interior, National Park Service, 2019.

As part of a national assessment of law enforcement provision in the National Park Service (NPS), this report summarizes an examination of personnel and workload for the Investigative Services Branch (ISB) and the Office of Professional Responsibility (OPR). ISB provides investigative services for offenses committed at NPS sites whereas OPR investigates complaints against NPS personnel.