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In this article, Jenner & Block Partner Kirsten Spira examines California Professional Rule of Conduct 3.3 in the context of civil litigation and a lying witness. The rule forbids lawyers from engaging or assisting in dishonest conduct and requires that a lawyer who knows a witness has lied take reasonable remedial measures including, if necessary, disclosure to a court, arbitrator, or administrative body. Kirsten also details what lawyers should do if they believe a witness is going to lie, how to respond when finding out a witness lied after testimonyis completed, and when withdrawal is permitted or required. "What remediation measures are appropriate, and whether withdrawal may be required, must be determined on a case-by-case basis, consistent with the lawyer’sother ethical obligations,” Kirsten explains.