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I am sorry to hear about your situation. Based on the facts that you stated, it sounds as though you have a legal defense to the criminal charge. If you can retain a private attorney, you should do so as soon as possible and they could contact the prosecutors office and speak with someone to hopefully sort this out, before charges are even actually filed. If you did the work and have evidence to support it as well as the fact that he wrote you the check, it is going to be hard for them to prove fraud, when he is going to have to testify. In addition, you could very well have a civil suit against him and sue to recover the damages suffered, as a result of his dishonesty and fraud. He can not benefit from the work you have done and not pay you, as well as the cost in defending a lawsuit without a legal basis.
Be patient at this point. He is going to make a demand for discovery and look over the evidence against you. Moreover, he will likely want to depose the "victim" and see what he has to say for himself. The facts that you stated sound as though he is the criminally here, not you but your attorney will need to see what he is going to testify to, if you go to trial. It is possible after the facts come out, the prosecutor may not want to proceed with them.
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