FBI retires its Carnivore
Carnivore became a hot topic among civil liberations, some network operators and many lawmakers in 2000, when an ISP's legal challenge brought the surveillance tool's existence to light. One controversy revolved around the FBI's legally-murky use of the device to obtain e-mail headers and other information without a wiretap warrant -- an issue Congress resolved by explicitly legalizing the practice in the 2001 USA PATRIOT Act.
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