"The Civil Rights Division of the United States Department of Justice opened its investigation of the Ferguson Police Department ('FPD') on September 4, 2014. This investigation was initiated under the pattern-or-practice provision of the Violent Crime Control and Law Enforcement Act of 1994, 42 U.S.C. § 14141, the Omnibus Crime Control and Safe Streets Act of 1968, 42 U.S.C. § 3789d ('Safe Streets Act'), and Title VI of the Civil Rights Act of 1964, 42 U.S.C. § 2000d ('Title VI'). This investigation has revealed a pattern or practice of unlawful conduct within the Ferguson Police Department that violates the First, Fourth, and Fourteenth Amendments to the United States Constitution, and federal statutory law."
U.S. Department of Justice: http://www.justice.gov/