"I have not authorized or permitted any person to utilize my Texas Driver License or Identification Card number or my name for any illegal purpose whatsoever.". A Forgery Affidavit form is primarily used when the payee's signature has been forged in the process of receiving payment through a Dallas County check.I am first duly sworn and state I am: Name. An affidavit of forgery is an official declaration that a fraudulent act was committed. It should be completed, notarized, and sent to notify institutions. Client "A" signs an affidavit stating his partner client "B" has forged checks to himself and deposited them into his own private account.