294 F.3d at 79 (quoting 5 U.S.C. § 552(b)(7)(E)) ("Congress also amended Exemption 7(E) to permit withholding of ‘guidelines for law enforcement investigations or prosecutions if such disclosure could reasonably be expected to risk circumvention of the law,' thus giving further indication that the statutory threshold was not limited to records or information addressing only individual violations of the law.”). 4 . We consider today the FBI, an agency with a clear law enforcement mandate. See Church of Scientology, 611 F.2d at 748. We express no opinion as to the application of Exemption 7 to “mixed” agencies with “both administrative and law enforcement functions.” See id. 5 . The Third Circuit has taken a similar approach. See Frankenberry v. FBI, 567 Fed.Appx. 120, 124 (3d Cir. 2014)
holding that user access codes that facilitated access to a law enforcement database were properly redacted under exemption 7e holding that requests for metadata and database schema of law enforcement information databases qualify for exemption under 7e holding cia clearance and investigatory processes and related law enforcement techniques and procedures exempt under exemption 7e holding that records concerning polygraph examination procedures and other law enforcement techniques are protected from disclosure under  exemption 7e holding that computer transaction and function codes that reveal how to navigate and retrieve information from a law enforcement database were properly withheld under exemption 7e