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  2. T-Mobile US - Wikipedia

    en.wikipedia.org/wiki/T-Mobile_US

    T-Mobile USA received a portion of the 1.3 million largely warrantless law enforcement requests for subscriber information (including text messages and phone location data) made in 2011, but refused to state how many requests it received. It did say that in the last decade, the number of requests have increased by 12 to 16 percent annually.

  3. Cellphone surveillance - Wikipedia

    en.wikipedia.org/wiki/Cellphone_surveillance

    Cellphone surveillance. Diagram showing the operation of a StingRay device for cellphone surveillance. Cellphone surveillance (also known as cellphone spying) may involve tracking, bugging, monitoring, eavesdropping, and recording conversations and text messages on mobile phones. [1] It also encompasses the monitoring of people's movements ...

  4. Carpenter v. United States - Wikipedia

    en.wikipedia.org/wiki/Carpenter_v._United_States

    Carpenter v. United States, 585 U.S. 296, 138 S.Ct. 2206 (2018), is a landmark United States Supreme Court case concerning the privacy of historical cell site location information (CSLI). The Court held that the government violates the Fourth Amendment to the United States Constitution when it accesses historical CSLI records containing the ...

  5. Communications Assistance for Law Enforcement Act - Wikipedia

    en.wikipedia.org/wiki/Communications_Assistance...

    The Communications Assistance for Law Enforcement Act ( CALEA ), also known as the "Digital Telephony Act," is a United States wiretapping law passed in 1994, during the presidency of Bill Clinton (Pub. L. No. 103-414, 108 Stat. 4279, codified at 47 USC 1001–1010). CALEA's purpose is to enhance the ability of law enforcement agencies to ...

  6. Stingray use in United States law enforcement - Wikipedia

    en.wikipedia.org/wiki/Stingray_use_in_United...

    The use of stingrays by United States law enforcement is an investigative technique used by both federal and local law enforcement in the United States to obtain information from cell phones by mimicking a cell phone tower. The devices which accomplish this are generically known as IMSI-catchers, but are commonly called stingrays, a brand sold ...

  7. Law enforcement in the United States - Wikipedia

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

    As of 2020, more than 800,000 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. Texas Ranger Division - Wikipedia

    en.wikipedia.org/wiki/Texas_Ranger_Division

    The Texas Ranger Division joins with all other enforcement agencies in the suppression of the same; under orders of the Director, suppress all criminal activity in any given area, when it is apparent that the local officials are unwilling or unable to maintain law and order; also upon the request or order of a judge of a court of record, Texas ...

  9. Law enforcement - Wikipedia

    en.wikipedia.org/wiki/Law_enforcement

    Law enforcement is the activity of some members of government who act in an organized manner to enforce the law by discovering, deterring, rehabilitating, or punishing people who violate the rules and norms governing that society. [1] The term encompasses police, courts, and corrections. These three components may operate independently of each ...