(a) No provision of this compact except Article V shall apply to any person institutionalized while under sentence in a penal or correctional institution or while subject to trial on a criminal charge, or whose institutionalization is due to the commission of an offense for which, in the absence of mental illness or developmental disability, the person would be subject to incarceration in a penal or correctional institution.
(b) To every extent possible, it shall be the policy of states party to this compact that no patient shall be placed or detained in any prison, jail, or lockup, but the patient shall, with all expedition, be taken to a suitable institutional facility for mental illness or developmental disability.