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I don't believe that you have to comply with their request OR just say your son didn't know everyone nor knew if they were underage drinking liquor. If that's not "blackmail" I don't know what is!!!! Obviously, they can't press charges against the kids unless your son would testify against them. Moreover, why can't they get the names of the alleged underage drinkers from the 18 year old?
What really does one issue have to do with the other. That kid assualted and battered your son and caused serious injury!
I would file a private criminal complaint against the 18 year old and if they don't take the private criminal complaint appeal that decision up to the next court. That 18 year old is liable to your son for all his damages.
You can also file a civil complaint against the 18 year old and keep the criminal courts out of the whole thing - your option - tell the DA where to go.
Exactly - it stinks!
I hate these cop shows and legal shows on TV - they make you believe that they are so "righteous" or when they do operate outside the law - that they are doing so because of their high moral and ethical standards. That's not the reality of what really is going on.