(1)  A prosecution for an offence against this Act may be commenced within 2 years after the date of the alleged offence or a longer period authorised by the Minister.

(2)  The Minister may authorise a prosecution after the expiration 2 years from the date of the alleged offence subject to the following qualifications:

(a) the prosecution must be commenced within 6 months after the circumstances of the alleged offence come to the knowledge of the prosecutor;

(b) the prosecution must be commenced within 10 years after the date of the alleged offence.