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The SFPD Investigation Unit, is primarily responsible for the investigation of major felony crimes. In addition to these investigations they are also responsible for the collection and preservation of evidence. The SFPD Investigators assigned to these crimes have developed an advanced level of expertise by attending specialized training.

Investigating major crimes requires the dedication, cooperation, and assistance of a variety of individuals and units. Investigators identify witnesses, preserve major crime scenes, gather critical information, and develop suspect leads. They also coordinate activities between the District Attorney's Office, Department of Human Services, Wisconsin Department of Corrections - Probation and Parole, F.B.I., State of Wisconsin Division of Criminal Investigations, various Correctional Institutions, the State Crime Lab, and many other organizations.