The American Civil Liberties Union of Pennsylvania filed a federal lawsuit on November 19, 2013, on behalf of Dennis Henderson, an African-American teacher who was arrested and jailed for 12 hours after criticizing the speed of a white Pittsburgh police officer driving by. All charges against Henderson were dropped by the district attorney, and the Office of Municipal Investigations (OMI) determined that the police officer had acted improperly.
https://www.aclupa.org/en/cases/henderson-v-gromek