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The Boston police department becomes the first local modern police department in the US.
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New York city combines its separate day and night watches into single city police force
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New York was the first to institute a dress code of dark blue for police officers
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First two African American police officers are hired by LAPD
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The New York Times uses 'police brutality' for the first time to describe the beating of a civilian by a police officer
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August vollmer, the police chief of Berkley,Ca, becomes the father of modern law enforcement
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the Pennsylvania state police becomes the first state police agency
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Berkeley's department was the first to use blood, fiber and soil analysis in investigations
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Alice Stebbins Wells becomes the first female police officer hired by the LAPD
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the first female deputy sheriff Margaret Q. Adams is hired by the LA County Sheriff's Department
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The lie detector was invented
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the fingerprint classification system was developed
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Radio-equipped squad cars were first used
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FBI inaugurated the forensics laboratory
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Due to riots and cases of police corruption, the NYC police department replaced the dark blue uniforms with a more friendly blue
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The United Police Canine Association is formed when two ther associations merge
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Uniforms returned to dark blue after the city experiences terrorists attacks