Therefore, the meaning of a particular scanner code or signal can vary between one police jurisdiction and another. There is no truly universal or official set of police 10 codes. In 1974, the Association of Public Safety Communication Officials expanded the use of the police radio codes to make them briefer and to standardize message traffic. Meaning, someone must know the meaning of the signals to understand the discussion.
In addition, the codes enable a certain amount of privacy to the radio transmissions. These radio signals were invented to help reduce the use of speech on the police radio. In 1940, the Association of Public Safety Communication Officials ( APC) published the first official set of police 10 codes. Originally, Police 10 codes were used in the United States law enforcement community prior to the Second World War. Plus, they help shield communications from the general public. The codes help streamline communication and also add an element of secrecy. Police officers are in constant communication with dispatch, other officers, support departments, the local jail, and county correctional facilities, and others.
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