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

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117. A lawyer must not suppress evidence which he or the client is obliged to preserve, disclose or produce, or participate in the fabrication of evidence he should know is false.
Moreover, he must not directly or indirectly unduly retain, steal, conceal, falsify, mutilate or destroy an exhibit from the record of a tribunal or an item of evidence.
O.C. 129-2015, s. 117.