O-6, r. 3 - Code of ethics of dispensing opticians

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3.09.05. All dispensing opticians who are partners or work together in the practice of their profession are jointly responsible for complying with the rules respecting advertising, unless one of them demonstrates that the advertising was made without his knowledge and consent and in spite of the measures taken to ensure compliance with those rules.
O.C. 1071-95, s. 2.