If no one was injured in the two vehicles, he will likely be charged for failing to stop and give information. It's a misdemeanor, Class B, I believe. The punishment range is up to 6 months in jail and/or a $2,000 fine. Get him an attorney so he can (hopefully) keep the charge from impacting your son's permanent criminal record.
Answered on Mar 10th, 2014 at 2:21 PM