I am first duly sworn and state I am: Name. This affidavit is made voluntarily for the purpose of establishing the fact that my signature is a forgery. 7.Do you know who forged your signatures? I swear or affirm under penalty of perjury the above stated facts are true and correct to the best of my knowledge. Form Name, Form ID, Revised Date, Fillable, Mandatory. Filling out the California Credible Witness Affidavit form requires accuracy and attention to detail.