In People v. Moon, 125 Mich App 773, 776; 337 NW2d 293 (1983), the Court explained the conditions under which a statute will be considered invalid under the Ex Post Facto Clauses of the United States and Michigan Constitutions: A statute which affects the prosecution or disposition of criminal cases involving crimes committed prior to the effective date of the statute violates the Ex Post Facto Clauses if it: makes punishable that which was not; makes an act a more serious criminal offense; increases the punishment; allows the prosecution to convict on less evidence.