Federal law enforcement officials do not keep track of how often courts approve requests to infect Internet users with malware in order to track down suspects, the department claimed in a court filing this month.

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“The Department of Justice does not maintain a central and complete listing of instances in which, in the course of an investigation, DOJ, any of its components, or any other federal law enforcement agency (such as the Department of Homeland Security) sought and/or received judicial authorization” to use “network investigative techniques,” attorneys for Justice wrote.