The State Opposition has used debate on proposed amendments to the Dangerous Sex Offenders Act to reveal details of an offender who has been charged with rape after being released into the community.

Shadow Attorney General John Quigley used parliamentary privilege to detail the case of Mark Bradley Wimbridge, as he argued for tougher restrictions on the release of dangerous sex offenders.

Mr Quigley told Parliament Wimbridge had a long history of sex crimes, and had been repeatedly assessed at high risk of reoffending, yet had been released on a supervision order.

Labor wants the amended legislation to require dangerous sex offenders to demonstrate they are no longer at risk of reoffending before being released.

Mr Quigley said the Wimbridge case demonstrated why.

"And what has happened? Wimbridge is now charged with breaching this supervision order in at least two ways," he said.

"Consuming alcohol and raping a woman last Saturday night while on a supervision order. Of aggravated sexual penetration," he said.

"What has happened? The court has said we'll come up with conditions which will protect the community.

"Well, it didn't protect the woman on the weekend who was raped, and it didn't stop Wimbridge consuming alcohol, which probably led to the offence."

Wimbridge is currently facing charges for the alleged rape, but the outcome of his case has yet to be determined by the court.

But while those proceedings continue, Mr Quigley said the Magistrate presiding over his court appearance had elected to detain him.

"Now fortunately, the Magistrate on Sunday morning remanded Wimbridge in custody," he said.

Mr Quigley said that reinforced the importance of one of Labor's proposed amendments to the laws requiring the mandatory detention of any dangerous sex offender charged with any offence.

"If you're charged with any breach of your supervision order, you must not be offered bail. You must be held in custody," he told Parliament.

Amended legislation still still flawed, says Quigley

The Government flagged changes to the DSO legislation in December last year, outlining a range of amendments to strengthen the act following a review completed 18 months earlier.

The amendment was introduced to Parliament in May.

Mr Quigley claimed the Governmtn tried to keep Wimbridge's offence "under wraps".

"They didn't want the community to know one of these dangerous sex offenders that has been released on a supervision order [had allegedly reoffended]," he said.

Speaking in support of the existing legislation, Police Minister Liza Harvey told Parliament it sought to give courts the power to deal with dangerous sex offenders effectively.

"You know, as a mother and a member of the community ... an aunty, a sister, and a daughter, yes, I don't want dangerous sexual offenders into the community. Of course I don't. I don't believe anybody does," she said.

"But the fact remains we have to abide by the Constitution and constitutionally we can't detain people indefinitely."