Glengarry Boys' Brigade; namely Warrant Officers, Lieutenants and Brevet Captains. In 1932 Percy Sillitoe, the Chief Constable of the City of Glasgow Police, abolished the traditional custodian helmet and added a new feature to the peaked caps worn by his police officers. This new feature was a black and white chequered cap band based on the dicings seen on the glengarry headress of the Scottish regiments. The diced band, popularly known as the Sillitoe Tartan, later spread to police forces in Australia, New Zealand, and the rest of the United Kingdom, as well as to some other parts of the world,
Police equipped with sirens and flashing light bars to aid in making others aware of police presence. Unmarked vehicles are used primarily for sting operations or apprehending criminals without alerting them to their presence. Some police forces use unmarked or minimally marked cars for traffic law enforcement, since drivers slow down at the sight of marked police vehicles and unmarked vehicles make it easier for officers to catch speeders and traffic violators. This practice is controversial, with for example, New York State banning this practice in 1996 on the grounds that it endangered motorists who might be pulled over by people