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  2. Police code - Wikipedia

    en.wikipedia.org/wiki/Police_code

    Police code. A police code is a brevity code, usually numerical or alphanumerical, used to transmit information between law enforcement over police radio systems in the United States. Examples of police codes include "10 codes" (such as 10-4 for "okay" or "acknowledged"—sometimes written X4 or X-4), signals, incident codes, response codes, or ...

  3. Radio scanner - Wikipedia

    en.wikipedia.org/wiki/Radio_scanner

    A scanner (also referred to as a radio scanner) is a radio receiver that can automatically tune, or scan, two or more discrete frequencies, stopping when it finds a signal on one of them and then continuing to scan other frequencies when the initial transmission ceases. The term scanner generally refers to a communications receiver that is ...

  4. Emergency service response codes - Wikipedia

    en.wikipedia.org/wiki/Emergency_service_response...

    A police radio dispatcher's desk from the Netherlands. Emergency service response codes are predefined systems used by emergency services to describe the priority and response assigned to calls for service. Response codes vary from country to country, jurisdiction to jurisdiction, and even agency to agency, with different methods used to ...

  5. Ten-code - Wikipedia

    en.wikipedia.org/wiki/Ten-code

    Ten-codes, officially known as ten signals, are brevity codes used to represent common phrases in voice communication, particularly by US public safety officials and in citizens band (CB) radio transmissions. The police version of ten-codes is officially known as the APCO Project 14 Aural Brevity Code.[ 1]

  6. Amid protests, US police scanner apps and others saw record ...

    techcrunch.com/2020/06/01/amid-protests-u-s...

    The Police Scanner app saw the most downloads of the group, with 19,000+ on Friday, nearly 24,000 on Saturday and 35,700+ on Sunday. However, the daily active user count for the Scanner Radio ...

  7. Law enforcement in the United States - Wikipedia

    en.wikipedia.org/wiki/Law_enforcement_in_the...

    As of 2020, more than 900,000 sworn law enforcement officers have been serving in the United States. About 137,000 of those officers work for federal law enforcement agencies. [ 1] Law enforcement operates primarily through governmental police agencies. There are 17,985 police agencies in the United States which include local police departments ...

  8. Kyllo v. United States - Wikipedia

    en.wikipedia.org/wiki/Kyllo_v._United_States

    Kyllo v. United States, 533 U.S. 27 (2001), was a decision by the Supreme Court of the United States in which the court ruled that the use of thermal imaging devices to monitor heat radiation in or around a person's home, even if conducted from a public vantage point, is unconstitutional without a search warrant. [1]

  9. Police ranks of the United States - Wikipedia

    en.wikipedia.org/wiki/Police_ranks_of_the_United...

    Rank. Although the large and varied number of federal, state, and local police and sheriff 's departments have different ranks, a general model, from highest to lowest rank, would be: Chief of police / commissioner of police / superintendent / sheriff: The title commissioner of police is used mainly by large metropolitan departments, while ...