O-7, r. 5 - Code of ethics of optometrists

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9. An optometrist must refrain from practising when in a condition likely to compromise the quality of his services. In particular, he must not practise his profession when under the influence of alcohol, drugs, hallucinogens, narcotic or anesthetic preparations, or any other substance likely to induce intoxication, weakening or disruption of the faculties, or unconsciousness.
O.C. 643-91, s. 9.