Corporate liability: persons in charge and officers liable for offences unless they prove lack of knowledge and due diligence. Section 81 imposed corporate liability by deeming both the company and every person in charge and responsible for the company's business at the time of an offence to be guilty, subject to a due diligence defence where the person proves lack of knowledge and that all due diligence was exercised. It also made directors, managers, secretaries or other officers liable if the offence resulted from their consent, connivance or neglect, and defined 'company' to include firms and 'director' in relation to a firm to mean a partner.