American Bar Association Model Rules of Professional Conduct - Rule 4.1. Truthfulness in Statements to Others

Rule

In the course of representing a client a lawyer shall not knowingly:

(a) make a false statement of material fact or law to a third person; or

(b) fail to disclose a material fact to a third person when disclosure is necessary to avoid assisting a criminal or fraudulent act by a client, unless disclosure is prohibited by Rule 1.6.

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See American Bar Association Model Rules of Professional Conduct