Steven T Greene Esq. Qualified as an expert in Criminal Law,30 years of Criminal Defense trial work. Hi glad to help. You would not be able to enter into a deal where you could guarantee the charges would be dropped as that is not up to you, it is the states decision, and you are not the victim in the criminal case the State is. Now if the deal is that you will ask them to drop charges, or you personally will not push the issue, or that you would sign a form to have it dropped, that type of an agreement you could make. I am glad to see they will pay you for your trouble. I think what you are asking is if an agreement like this is legal. I do not see why it would not be. It is not an agreement to do anything that is against the law. And as long as both parties feel it is fare to make this deal. The problem is there still is a criminal cause of action that has already been put into motion and it is not true that if you signed this you would no longer have a cause of action. As criminally it is not your action, the victim is the State. Thus the only agreement with them you can make is that you will not pursue it, and that you will ask for it to be dropped, other than this you cannot agree that the prosecution will be stopped as you are not in control of that. Sincerely, XXXXX XXXXX and yes you can entertain it when the investigation is going on, but I would disclose to the state and police that you no longer wish to proceed as you have been compensated.