C-15, r. 4 - Code of ethics of chemists

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47. The chemist shall generally act in the same matter for only one of the parties in question. If his professional duties require that he act otherwise, the chemist shall specify the nature of his responsibilities and shall keep all the interested parties informed that he will cease to act if the situation becomes irreconcilable with his duty of impartiality.
O.C. 27-2001, s. 47.