Typically probation runs criminal history checks right before probation ends. They will probably pick it up. Also, many probation agreements require you to notify your probation officer immediately if you are arrested on a new charge. Check with your criminal defense attorney.
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It varies from state to state. In Massachusetts it would be as soon as you are arraigned on your new matter and even if they found out after your probation ends the arrest still occurred within your probation. You should ask a lawyer in your state. Good luck.
Do your conditions of probation require you to report arrests to your probation officer? If so, when must that be done? If you fail to comply with a condition of probation that requires you to report arrests, that would be another violation.
Another question is whether the probation department and the prosecutor could get a motion to revoke filed and a warrant issued for your arrest before the probation expires. Back in my days as a prosecutor, I got all that done a few times in an afternoon. But, that required special attention and my walking the papers through myself. Would a Fort Worth probation officer and prosecutor care enough to go to that effort. I have no idea.
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