I am not surprised that your son was kept in jail, as he came back involuntarily because of a warrant, and the matter was put over just for a short date for probation to get their file and prepare their case. Near as I can figure, your son is on the calendar for a hearing on his violation of probation. He should be entitled to have a lawyer represent him at that hearing, as probation will be deciding what sanctions he will be facing on the warrant matter and that will decide what penalties he'd face for the traffic infractions,
If he had a lawyer on that old case who was with him when your son took the plea to probation, you ought to try to reach him and let him know that your son has been violated and will be in court for a hearing on Monday afternoon. With luck, he'd be available for the hearing. As the attorney of record on the underlying offense, this would still be his case. So your son could ask for his lawyer to be notified or for a public defender. If he's denied a lawyer and he doesn't like the way Monday comes out, he'll have at least put his request for an attorney on the record, and that could give him some grounds to appeal the sentence
But the real problem here is the violation of probation. But for that, he'd have probably ended up just paying fines. Defendants who are already on probation don't have all of the same rights that other people get, because they have already been sentenced. And I'm confident that when your son first pled guilty he was told how much jail he might be facing if he violated the terms of probation. That's what's hanging over his head, and if probation no longer wants to work with your son on the old case, they will ask the judge to resentence him and make a recommendation to the court of how much time they think he should do.
As you can see, a lawyer's hands are somewhat tied in these situations. Usually with a violation, probation gets what it asks for and there isn't a lot of bargaining room. If they give him time on the violation, the judge would likely run the traffic matters together with that so that when he comes out, he doesn't have to worry about probation any more. If probation decides to let him have another chance, then he gets out and attends probation for both matters.
Without knowing what his warrant is for and how long it's been out there against him, I cannot tell you how much good a lawyer is likely to do on Monday, but if he really doesn't know what's going on, he has to let the judge know that and ask for an attorney.
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