Council shall have the power, by ordinance, to make or cause to be made, investigations, audits, or studies of the City and the conduct of any City department, office or agency, and, for this purpose may retain professional and technical assistance, subpoena witnesses, administer oaths, take testimony, require the production of evidence, and provide funds for such investigation, audit, or study.
The subjects of such investigation, audit, or study shall be specifically stated in the authorizing ordinance.