Disclaimer: The materials provided below are informational and should not be relied upon as legal advice.
When someone signs a a false declaration under "penalty of perjury" she/he may be subject to prosecution for perjury. Ultimately, it will be up to the prosecutors to decide whether or not they will prosecute this declarant. If the falsity of these statements can be shown, aside from perjury charges, the court would generally disregard the declarant's statements. You should consult your own attorney to protect your legal rights.