Section 4409 - Effect of commitment on pending criminal proceedings; duration of commitment; authority of attorney for the Commonwealth(a) Whenever a person who has been charged with crime is committed in accordance with either section 407 or section 408 of this act, the criminal proceedings against him shall be stayed for the duration of commitment, provided however, that the Attorney for the Commonwealth may submit indictments to the grand jury involving such charge.(b) If such person shows a sufficient improvement of condition so that his continued commitment is no longer necessary, he shall be returned to the court having jurisdiction of him for trial or such other disposition of such charges as the court may make.(c) The Attorney for the Commonwealth may also at any time during the period of commitment, petition the court for a rule upon the director of the facility where such person is committed to show cause why the commitment should not be revoked and the person so committed brought to trial if the interests of justice require prosecution of such person.1966, Special Sess. No. 3, Oct. 20, P.L. 96, art. IV, § 409, effective 1/1/1967.