Shock probation is only for those who have not been to prison. The point is that they will have been "shocked" into going the straight and narrow when they go to prison. If they have been before, it means nothing.
With a six year sentence, he probably wouldn't want to go with shock probation anyway. He will be parole eligible when his actual and good time add up to 1/4 th of the sentence. Which means he could be parole eligible in as little as 1/8th of the sentence. (Unless there was a finding that it was within 1000 feet of a school zone, etc.) Parole is much easier to complete than probation. There is just no guarantee when, or if he will parole out.
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A prisoner who has been to TDC before is not eligible for shock probation. I agree with the others who have said that.
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