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These warrants are never going to go away. So, your son is going to have to face them some day.
My suggestion is that your son consult a local criminal defense attorney and negotiate a deal for him to turn himself in and be allowed to bond back out.
If all of the charges are misdemeanors, he should be allowed to bond out. Also, the attorney can work with the prosecutor to get the best deal for your son in terms of punishment, and hopefully keep him out of jail.