Police Frequency Codes - Online Jobs Hiring No Experiencesupport And Help Search Result The codes were originally developed in 1937 to allow for. Codes like โcode 3โ (lights and sirens) and โcode 2โ (without sirens) tell units how urgent the situation is. โcode 4โ means the call is over. Good communication is key to saving. Police scanner frequencies are specific radio frequencies used by law enforcement agencies to communicate with their officers and dispatchers. These frequencies allow anyone.
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