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Lawyers are bond by an ethical code - and can be disbarred if they break it. Each state has its own set of rules for conduct, but they are generally based in the American Bar Associations model rules. Long story short - you cannot offer false evidence nor enable your clients to lie to the court. In some circumstances, the lawyer is ethically bond to withdraw from representing the client if the client insists on lying.
Most law schools require students to take a mandatory class in ethics, and most U.S. states require applicants to pass an ethics exam (in addition to the Bar Exam!). These type of issues are generally addressed in by those prerequisites to becoming an attorney. Moreover, many states also require admitted attorneys to take a certain amount of hours in Continuing Legal Education (CLEs), often designating some of those in ethics classes.
Check out Rule of Conduct for attorneys here https://www.americanbar.org/groups/professional_responsibility/publications/model_rules_of_professional_conduct/model_rules_of_professional_conduct_table_of_contents/
Research ABA's suggestions for how to handle clients who lie: https://www.americanbar.org/news/abanews/publications/youraba/2019/september-2019/what-to-do-when-your-client-lies/
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