Reading Room Document
Use of Mail Covers in FBI Investigations Under the Foreign Intelligence and Foreign Counter-Intelligence Guidelines
National Security Mail Covers—Constitutional Challenge—Federal Bureau of Investigation (39 CFR 233.2(d)(2)(H)) The OLC does not provide release dates for its opinions, so the release date listed is the date on which the opinion was authored. The original opinion is available at www.justice.gov/file/21776/download.
The OLC's Opinions
Opinions published by the OLC, including those released in response to our FOIA lawsuit