A person commits forgery if, with intent to defraud, the person: 1. Falsely makes, completes or alters a written instrument; or 2.ARS § 13-2002 defines Arizona's forgery law. To schedule a free consultation with a top Phoenix forgery lawyer, call the Belén Law Firm at (602) 715-0908 today. In Arizona, a written instrument may be considered a forged instrument if it has an altered dollar figure or other material information. We have the best criminal defense attorney in Phoenix, AZ to fight your forgery charges. Call (602) 492-8452 for a FREE consultation on your case. (general) A written instrument guaranteeing the performance of acts.