This kind of regulation-by-prosecutor has also occurred at the state level, for example at the New York Attorney General’s Office under Eliot Spitzer and Andrew Cuomo.
Crown Prosecution Service | Immunity from prosecution | Witness for the Prosecution (1957 film) | Witness for the Prosecution | immunity from prosecution | Deferred Action for Childhood Arrivals | Witness to a Prosecution | Prosecution of Marte Dalelv |