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Based on the information provided I think you owe it to your son to pursuit this matter. I think that in any situation where you have an adult assaulting a younger person that the court will favor the victim. If your son was assaulted in my mind it doesn't matter that there wasn't physical evidence. Of course it would be easier but that doesn't mean it didn't occur. If I'm the 19 year olds lawyer I'm talking to the DA to see what kind of deal he'll offer me. Thanks for your question and I hope this has given you some information in this matter...
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