This question keeps coming up. As the law currently stands, he will have to serve 85% of his sentence. None of us knows whether or not this may change in the future to 65% (or another number) through an act of the legislature. As for now, this is only a rumor.
As we are today and in the foreseeable near future it will be 85%. There are no plans or even talk outside the prison walls of dropping it to 65%. Inside the prison walls there is plenty of talk amongst the inmates about dropping it to 65% as though as it is an April fools prank.
for Fairness / for Your Freedom
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I believe the urban legend that violent offense time credits will change from 85% to 65% was started by a jail house lwop lawyer.