Markus Funk published a book for the Federal Judicial Center titled "Mutual Legal Assistance Treaties and Letters Rogatory: Obtaining Evidence and Assistance from Foreign Jurisdictions." This guide provides an overview of the statutory schemes and procedural matters that distinguish mutual legal assistance treaties and letters rogatory. It also discusses legal issues that arise when the prosecution, the defense, or a civil litigant seek to obtain evidence from abroad as part of a criminal or civil proceeding.