Every person who contravenes this Act, other than section 15, or the regulations, other than a regulation made under clause 23(h), (j) or (l), or of an order made under subsection 17(4), is guilty of an offence and on conviction is liable for a first offence to a fine of not more than $2,000 or to imprisonment for a term of not more than three months, or to both, and for a subsequent offence to a