The Adjutant General may adopt rules in accordance with the Illinois Administrative Procedure Act which establish pretrial, trial, and post-trial procedures, including modes of proof, for courts-martial cases arising under this Code and for courts of inquiry, and which shall apply the principles of law and the rules of evidence generally recognized in military criminal cases in the courts of the Armed Forces of the United States but which may not be contrary to or inconsistent with this Code. The Governor or the Adjutant General may prescribe courts of inquiry by regulations, or as otherwise provided by law, which shall apply the principles of law and the rules of evidence generally recognized in military cases.