sunbird writes: "The Electronic Frontier Foundation filed a lawsuit in the United States District Court in San Francisco on behalf of an anonymous petitioner seeking to challenge a National Security Letter (NSL) the petitioner had received. NSLs are issued by law enforcement with neither judicial oversight nor probable cause, and have been discussed on Slashdot before. In response to the lawsuit, the U.S. Department of Justice filed a separate lawsuit against the individual who had received the NSL, requesting that the court order the receipient to comply with the NSL and asking the court to find that the "failure to comply with a lawfully issued National Security Letter interferes with the United States' vindication of its sovereign interests in law enforcement, counterintelligence, and protecting national security." Both cases are filed under seal, but heavily-redacted filings are available. The cases remain pending."