That no person shall, for any indictable offense, be proceeded against criminally, by information, except in cases arising in the militia and volunteer forces when in actual service, or when assembled under arms as a military organization, or, by leave of the court, for misfeasance, misdemeanor, extortion, and oppression in office, otherwise than is provided in the Constitution; provided, that in cases of misdemeanor, the legislature may by law dispense with a grand jury and authorize such prosecutions and proceedings before justices of the peace or such other inferior courts as may be by law established.