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And according to reports, it's unlikely that any appeal against the decision would be successful.
Guider was accused of making friends with single mums in order to babysit their children, where he would end up molesting them and taking pictures of them naked.
He was locked up in 1996 after being convicted of more than 60 child sex offences.
Guider has never told detectives or Samantha's family where he buried her body.
As part of his release condition (there are 56 in total), Guider cannot buy, possess, access, obtain, view, participate in or listen to any material classified as pornographic or violent and he will be subject to 24/7 electronic monitoring.
He also can't go near daycare centres, preschools, schools, amusement parks, cinemas, libraries, camping grounds, playgrounds, pools and other such recreational areas where children could be.
The public has been promised that he will be 'watched like a hawk' to make sure he doesn't reoffend.
Attorney-General Mark Speakman told Channel 9: "Ideally, he would be in jail. We have done the best we can to try to keep him detained and failing that, have him under very strict conditions.
"But I can promise the family of Samantha Knight and the people of NSW that we have fought this case as hard as we can to leave no stone unturned, to keep Guider locked up or under extended supervision.
"He will be supervised incredibly closely and we will watch him like a hawk."
But unsurprisingly, Guider's victims and their loved ones are devastated a serious criminal has been allowed to walk free.
Samantha's mum Tess told reporters: "We should all be shocked. He hasn't demonstrated that he's changed.
"So not only hasn't he told us what he did with Samantha's body - and there will be no body to find anymore, it's a long time - but he hasn't given me and my family and Samantha's friends any details of what happened that day."
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