Randolph Street near Des Plaines Street. Station No. 3 was on Michigan Street (since then renamed Hubbard Street) near Clark Street. Political connections were important to joining the force; formal requirements were few, until 1895. After 1856, the department hired many foreign-born recruits, especially unskilled, but English-speaking, Irish immigrants. In 1860, the detective forces were established to investigate and solve crimes. In 1861, the Illinois General Assembly passed a law creating a police board to become an executive department of Chicago autonomous of the mayor. The mayor was effectively stripped of his power to control the Chicago Police Department. Authority was given to three police commissioners. The commissioners created the office of superintendent to be the chief of police. The title is again in use today. The first African American officer was appointed in 1872, but black police were assigned to duty in plain clothes only, mainly in largely black neighborhoods. In 1875, the Illinois General Assembly found that the police commissioners were unable to control rampant corruption within the Chicago Police Department. The legislature passed a new law returning power over the police to the mayor. The mayor was allowed to appoint a single police commissioner with the advice and consent of the city council. In 1896, a parade of Chicago police officers was the subject of the first film ever to be shot in Chicago. Women entered the force in 1885, as matrons, caring for female prisoners. Marie Owens is believed to have been the first female police officer in the U.S., joining the Chicago Police Department in 1891, retiring in 1923. Holding the rank of Sergeant, Owens enforced child labor and welfare laws. Despite centralized policies and practices, the captains who ran the precincts or districts were relatively independent of headquarters, owing their jobs to neighborhood politicians. Decentralization meant that police could respond to local concerns, but graft often determined which concerns got the most attention. In 1895, Chicago adopted civil service procedures, and written tests became the basis for hiring and promotion. Standards for recruits rose, though policing remained political. 20th century In 1906, the Department's Mounted Patrol was created to provide crowd control, and in 1908, the force was granted its first three motor cars, expanding in 1910 to motorbikes and boats. Female officers were formally appointed beginning on August 13, 1913, starting with ten officers. In 1918, Grace Wilson, possibly the first black female