The union representing police officers has criticised a treatment facility for intellectually disabled sex offenders that releases clients into the community unsupervised.

Offenders are treated at the Disability Forensic Assessment and Treatment Service in Fairfield rather than prison.

The Herald Sun says it has found almost one in five people treated at the centre reoffend and many are returned to the community without supervision.

The Police Association’s Bruce McKenzie says the community deserves a guarantee predators will not reoffend.

“The community ought to have a 100 per cent guarantee that the treatment programs that are adopted for these sexual predators are such that they will not reoffend.”

But the Minister for Disability Services, Mary Wooldridge, says the facility uses world’s best practice and provides offenders with the best chance for rehabilitation.

“It’s a clinical approach, it’s a planned approach, it’s monitored very carefully,” she said.

“It actually enhances community safety to make sure that these individuals have the best possible ability to manage independently in the future.”