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
City of Glasgow Police to prevent crime and detect offenders. The policemen they envisaged would not be mere watchmen and what they had written down was the concept of "Preventive Policing", 40 years before Sir Robert Peel established preventive policing in the Metropolitan area of London in 1829. In February 1789 this force of truly professional police took to the streets. During the following eleven years, Glasgow City fathers tried to get their "Police Bill" before Parliament, but without success. In the meantime, the small, pioneering, Glasgow police force, led by the Master of Police, Richard Marshall, was struggling to maintain its existence due