Pittsburgh Police hats with checkered bands, which are dark navy blue and gold in color, popularly known as the "Sillitoe Tartan" and named after its originator, Percy J. Sillitoe, Chief Constable of Glasgow, Scotland, in the 1930s. While the checkered band is a common police symbol in the United Kingdom, Australia and some European countries, the Chicago Police Department, Cook County Sheriff's Police, the Allegheny County Sheriff's Office, and the Pittsburgh Bureau of Police are the only police forces in the United States that have adopted it as part of their uniforms. As recently as July 1930, police were required to wear
Private police in the United States Private police in the United States Private police in the United States are law enforcement bodies that are owned and/or controlled by non-governmental entities such as security agencies. There is a strong overlap between the work of police and security, given that they share the same goals, perform the same activities and cooperate with one another, and often the same individuals work in both fields simultaneously, with police moonlighting as security officers. The overlap is even more pronounced when the police are private. Thus, it can be hard to draw a line between what is a private policeman and what