Normally, a preliminary hearing is held after a defendant is accused of violating the terms of his/her probation. At the preliminary hearing, the defendant is given an opportunity to either admit or deny the alleged probation violation. If the defendant admits to violating the probation terms, the court will sanction the defendant. If the defendant denies the probation violation, the court will usually set the matter for an evidentiary hearing. The court could consider the defendant's criminal record and history on probation when sanctioning the defendant if the court indeed finds that the defendant violated the terms of his/her probation. It's impossible to know what will happen in court without knowing more details regarding the alleged probation violation.
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