If you possess a completed or modified written instrument you know is fake and you do so with the intent to defraud or deceive another. Forgery, deceive or injure another, he falsely makes, completes or alters a written instrument which is or purports to be.What is criminal possession of a forged instrument in the third degree? What happens if you are charged and what you should do next? It is never recommended to join a company with fake documents. Criminal possession of a forged instrument is a legal charge that falls under the broader category of forgery and fraud offenses.