I would call a Lawyer first and foremost. All too often the police know the DNR around where I am at and everyone seems to look out for each other. I am not the biggest fan of Lawyers but at least they could view the laws. In this case I would think the DNR would be liable and you could have a lawsuit against them so they would likely can the guy and play nice to keep it out of court. Then again you are taking on the state so this could be a lose lose situation.