That depends on the document and the intent behind the falsity. Also depends on whether the document was verified or had its truth attested to.
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Depends upon the document. Some papers are sworn under penalty of perjury, others arent. It isnt easy to prove perjury, and most prosecutors dont get too worked up about this in civil cases. Maybe if its a big case with notariety, or you can hand them the proof on a silver platter. Id focus more on proving the other sides statements arent true so you can prevail in the case at hand.