I read here on FR that the IG can’t issue a subpoena.
How much inspecting can you do like that?
The OIG is a division inside the Department of Justice. During an internal investigation if the IG becomes aware of unlawful activity he/she is obligated to inform the AG (Sessions) or AAG (Rosenstein). He can’t ignore it and he cannot delay notification of it. Unlawful activity must be reported.
The IG does not have legal or prosecutorial authority – the IG must immediately refer unlawful activity to the proper authority; essentially to his boss. A DOJ prosecutor is then assigned to work with the IG and essentially creates a parallel investigation focused only on the law-breaking part.
[That prosecutor could, likely would, then begin a Grand Jury proceeding;
no-one outside the AG, AAG, and that prosecutor’s office would know.]