Exemption 7(D) of the Freedom of Information Act, 5 U. S. C. § 552 (FOIA), exempts from disclosure agency records "compiled for law enforcement purposes . . . by criminal law enforcement authority in the course of a criminal investigation" if release of those records "could reasonably be expected to disclose" the identity of, or information provided by, a "confidential source." § 552(b)(7)(D). This case concerns the evidentiary showing that the Government must make to establish that a source is "confidential" within the meaning of Exemption 7(D). We are asked to decide whether the Government is entitled to a presumption that all sources supplying information to the Federal Bureau of Investigation (FBI or Bureau) in the course of a criminal investigation are confidential sources.

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