Overview of Texas Forgery Laws. Texas forgery law makes it a crime to forge a "writing" with intent to defraud or harm another person.In the State of Texas, an individual will be charged with forgery when they forge a writing with the intent to harm or defraud another individual. Signing another's name with permission is not forgery, but be sure that you sign in a way that reveals the permission. A person commits an offense if he forges a writing with intent to defraud or harm another. The most basic and widely known illustration of forgery is replicating someone else's signature without permission. At the Law Office of Patrick J. McLain, PLLC, we provide assertive and knowledgeable representation for individuals facing forgery charges.