115.46. Penal proceedings for offences under this Act or the regulations are prescribed by the longer of(1) five years from the date the offence was committed;
(2) two years from the date on which the inspection or investigation that led to the discovery of the offence was begun if(a) false representations were made to the Minister, or to a functionary, employee or other person referred to in section 119, 119.1, 120 or 120.1;
(b) the offence relates to hazardous materials covered by Division VII.1 of Chapter I;
(c) the case involves an offence under section 20.
In the cases referred to in subparagraph 2 of the first paragraph, the certificate of the Minister, inspector or investigator constitutes, in the absence of evidence to the contrary, conclusive proof of the date on which the inspection or investigation was begun.