Suppose that the U.S. Department of Justice (DOJ) has a belief or opinion about what the proper interpretation of a certain statute or Constitutional provision is, and that they have formalized their opinion on this matter in a memo produced by the DOJ's Office of Legal Counsel (OLC). My question is, can a federal prosecutor, i.e. a prosecutor working for the DOJ, go against such an opinion of the DOJ? Are there DOJ rules or regulations which prohibit this, and would a prosecutor who went against an opinion of the DOJ be subject to disciplinary actions?
If there are such rules or regulations, do they apply to a Special Counsel?
By the way, this question was inspired by my Politics.SE question here, which is related to an OLC memo that states that the DOJ does not have the power to indict a sitting President. I was asking about whether if a federal prosecutor tried to pursue such an indictment anyway, if it would run afoul of DOJ rules and regulations. But that got me thinking about going against OLC memos in general.