Your son should plead, beg, borrow, and (figuratively) steal for the funds necessary to get a lawyer, and then should hire one. I have seen college graduates have to deal with what happened with MIP cases where they didn't hire an attorney- and they dealt with it as they were denied jobs because of it.
Hire an attorney. There are lots of good ones. Good luck.
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Unless there are very aggravating circumstances, the Solicitor's Office in Athens will allow your son to enter the pre-trial diversion program. If he complies with all the conditions of the program, which are usually paying a fine, community service and staying out of trouble for 6-12 months, the charges will be dismissed. The Solicitor also usually agrees to allow his arrest to be expunged, meaning that it won't show up on a criminal background check if he applies for a job.