Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Not written by a barrister. The name was thought up by a second-year American law student sitting in a coffeehouse in Manhattan. Neither an authoritative statement of the law nor legal advice. Don't rely. Quick work.
Fifth Circuit: Arnone v. County of Dallas
A prosecutor elected within a county and acting within a county is, however, a state officer as opposed to a county officer when deciding questions of or setting policy relevant to the revocation of deferred adjudication in individual cases.