t sure how Mueller gets away with no report, with no absolute clearance of Pres. Trump. That leaves the door open for endless House investigations (I think there are now 6) of all Trump matters Ken Starr operated under a law that created special prosecutors. Part of that law require him (and his successor) to file reports on the matter under investigation. That law no longer exists.
Mueller was merely appointed by Sessions, and so has to follow the same rules as all other Federal prosecutors. As a matter of course they don't write long reports about what they think about the things they investigate. They charge crimes when they find them.
Prosecutors do file a short memo with their supervisors explaining why they charged or chose not to charge key individuals. These are never released to the public.
Because they discuss innocent people, or at least those not accused of any crime.
Comey violated this rule with his first Clinton exhonoration, and was criticized by everyone, left and right.
I expect Mueller to do exactly what is required, a short memo to his boss, and nothing else.
Looks like a report is required and the release is up to AG.
https://www.govregs.com/regulations/expand/title28_chapterVI_part600_section600.1
§600.8 Notification and reports by the Special Counsel
(c) Closing documentation. At the conclusion of the Special Counsel's work, he or she shall provide the Attorney General with a confidential report explaining the prosecution or declination decisions reached by the Special Counsel.
§ 600.9 - Notification and reports by the Attorney General.
c) The Attorney General may determine that public release of these reports would be in the public interest, to the extent that release would comply with applicable legal restrictions. All other releases of information by any Department of Justice employee, including the Special Counsel and staff, concerning matters handled by Special Counsels shall be governed by the generally applicable Departmental guidelines concerning public comment with respect to any criminal investigation, and relevant law.
I've had an FOIA in since 08/2017 asking for documentation under 600.3 of the detailed results of the appropriate background investigation and detailed results of the review of ethics and conflicts of interest issues
(b) The Attorney General shall consult with the Assistant Attorney General for Administration to ensure an appropriate method of appointment, and to ensure that a Special Counsel undergoes an appropriate background investigation and a detailed review of ethics and conflicts of interest issues...
DOJ advised me in 09/2018 that this FOIA should have been filed in 2 different depts. So far, crickets chirping.