The Principal Act is amended by substituting the following for subsection (3) of section 224:
"(3) Notwithstanding the provisions of subsection (1) or any provision in any enactment specifying the period within which proceedings may be commenced, a prosecution for a summary offence under this Act may be brought at any time within whichever of the following periods later expires -
(a) 2 years commencing on the date on which the offence was committed, or
(b) 18 months commencing on the date on which evidence sufficient to justify the institution of the prosecution came into the possession of the Minister.".