Source:
WiredFBI personnel who used misleading emergency letters to acquire thousands of Americans' phone records are the subject of a criminal investigation, top bureau officials told civil liberties groups Monday.
The unprecedented criminal probe, revealed at an outreach meeting led by FBI director Robert Mueller and general counsel Valerie Caproni at FBI headquarters, is looking at the actions of an antiterrorism team known as the Communications Analysis Unit, according to two people who attended the meeting independently and who informed Wired News, requesting anonymity.
The privately disclosed investigation would mark the first time government officials have faced possible prosecution for misuse of Patriot Act investigative tools, and highlights the seriousness of recent reports about the FBI's misuse of a powerful self-issued subpoena known as a National Security Letter.
Unit employees, who are not authorized to request records in investigations, sent form letters to telephone companies to acquire detailed billing information on specific phone numbers by falsely promising that subpoenas were already in the works.
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http://www.wired.com/politics/law/news/2007/07/exigentinvestigation