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A network software diagnostic tools created and used by the U.S. Federal Bureau of Investigation (FBI) in crime investigation. Carnivore is a Windows-based with packet-sniffing software that is installed at an Internet service provider (ISP) to sniff traffic on a LAN, looking for e-mail messages in transit. The FBI may only use the Carnivore system in places where permission by the system or ISP owner has been granted, or with a a court order as part of an investigation. The FBI has retired Carnivore and now uses commercial products instead.

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