Yes, when you son reports it as his probation requires.
Being sent to jail for a period up to the maximum being faced on his original DUI charge. Or nothing or anything in between.
Nope. The PO is going to find out, one way or the other. It is better that they hear it from your son.
Letting your son face the consequences of his poor decisions. Letting your son do his own research when he screws up. Getting your son into AA or other alcohol treatment because he obviously needs it and it looks good to the court.

