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One of WA's worst sex offenders who still has "deviant" sexual urges has been released from prison to live in suburban Perth less than two years after a judge declared the community would be at risk if the paedophile were set free.

Supreme Court Justice John McKechnie decided this week to release Alwyn Wayne Brown, who has spent most of the past 13 years behind bars for a string of sex crimes against young girls, on an eight-year supervision order that includes 45 strict conditions.

Despite Justice McKechnie conceding Brown was still at risk of reoffending, he was confident he could be managed in the community after voluntarily taking drugs to reduce his sex drive and undergoing counselling, resulting in "significant treatment gains".

In December 2010, Justice Eric Heenan declared Brown a dangerous sex offender and ordered him to be jailed indefinitely, with his status to be reviewed annually.

Justice Heenan said it was "disquieting" he was concentrating his sexual offending on "young, vulnerable, unprotected and innocent children".

Justice McKechnie acknowledged Brown's new address in Melville - details of which he suppressed - was near schools, buses, shopping centres, sporting complexes and public open spaces.

But he said the evidence was that Brown's anti-libidinal medication was working to reduce his "deviant sexual fantasises".

"(Brown) is at risk of relapsing into sexual offending behaviour," he said.

"(But) I am satisfied that the community can be adequately protected by the respondent's release on a supervision order."

News of Brown's release prompted some community concern, with Melville Senior High School board chairman Paul Richards worried about Brown not being monitored "around the clock". He said child safety should be paramount.

"The community would be concerned about somebody deemed too dangerous a short while ago now being released into the community," Mr Richards said.

City of Melville acting mayor Clive Robartson said it was natural to be concerned but people should be sensible and give the court conditions a chance to work.

"There needs to be some level of acceptance that people are going to be rehabilitated into communities," he said.

Shadow police minister Michelle Roberts said Brown - freed on Wednesday - should not be released if at any risk of reoffending.

Brown was jailed in 1999 for luring a six-year-old girl from a Broome hostel and attempting to rape her.

He was released in 2003 but was back behind bars six months later, sentenced to 4½ years jail for sexually abusing a 10-year-old girl in Morley.

Justice McKechnie noted the State "did not point to anything against his release on strict supervision".

Police Minister Liza Harvey said serious child sex offenders belonged in jail but when a court released them the community should be able to know where they were.

The planned paedophile register was an "effective tool" to protect the community, she said.