They say expectation is most people will be released 33-50% of the way through their sentence, but they could serve their whole sentence in custody. Given current state of prisons & how difficult it is to get onto rehabilitative courses, might be v difficult for offenders to prove good behaviour.
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And already it looks like neither time nor resources may be enough.
so...there's a layer of bureaucracy implied in removing automatic release too that will clog up exits. never mind risk aversion / bias as you say.