B-1, r. 3.1 - Code of Professional Conduct of Lawyers

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28. A lawyer must determine together with the client the terms, conditions and scope of the mandate given to him. In particular, he must set out in an objective manner the nature and scope of the problems as he sees them on the basis of the facts brought to his attention and the risks inherent in the measures recommended.
A lawyer must obtain the client’s consent to the mandate, paying particular attention and care when the client is vulnerable due, in particular, to his age or his physical or psychological condition.
O.C. 129-2015, s. 28.