N.Y. Civil Practice Law & Rules § 4520: Certificate or affidavit of public officer

Rule 4520. Certificate or affidavit of public officer. Where a public

officer is required or authorized, by special provision of law, to make

a certificate or an affidavit to a fact ascertained, or an act

performed, by him in the course of his official duty, and to file or

deposit it in a public office of the state, the certificate or affidavit

so filed or deposited is prima facie evidence of the facts stated.