Rule 3.3 of the ABA Model Rules of Professional Conduct, which has been adopted in all U.S. jurisdictions, requires attorneys to be candid with tribunals. Lawyers cannot knowingly make false statements of fact or law to a court, cannot fail to correct a material misrepresentation they made previously, and cannot present false evidence. The duty of candor applies to all attorneys in all courts, including government lawyers representing the United States. Courts can sanction attorneys who violate the duty of candor, impose contempt findings, and report the violation to bar associations for disciplinary review. The rule reflects the principle that courts can only function fairly if the parties appearing before them tell the truth.