Perjury

The crime of intentionally lying after being duly sworn (to tell the truth) by a notary public, court clerk or other official. This false statement may be made in testimony in court, administrative hearings, depositions, answers to interrogatories, as well as by signing or acknowledging a written legal document (such as affidavit, declaration under penalty of perjury, deed, license application, tax return) known to contain false information. Although it is a crime, prosecutions for perjury are rare, because a defendant will argue he/she merely made a mistake or misunderstood.