This is really a question for DPS. The defendant is sometimes required by the court to take certain classes. If the requirement for the class is reported to DPS, but the defendant does not take the class or does not provide a certificate of completion, DPS will suspend the defendant's license. Sometimes, proof of completion of the course is all that is necessary. The defendant should call DPS if he/she does not know why his/her license has been suspended or if he/she has any questions regarding reinstatement. This can get rather complicated and cannot be completely answered here.