Western Australia's attorney-general says the state will have the nation's toughest dangerous sex offender laws after the government won support for changes to parole and bail legislation.
The McGowan government fulfilled a key election commitment late on Thursday after the Upper House approved changes to the Dangerous Sexual Offenders Act 2006 and the Bail Act 1982.
The new laws will reverse the onus of proof so dangerous sex offenders, those considered at high risk of reoffending, must satisfy a Supreme Court judge they will stick to their parole conditions.
Offenders who breach supervision orders will be refused bail except under extraordinary circumstances.
New legislation will also provide for interim supervision orders, expected to be granted to monitor offenders in the short term during court proceedings.
Attorney-General John Quigley says the changes will put pressure on offenders during parole reviews to give or introduce evidence they are fit to be released.
Mr Quigley says the legislation is "more in line with broader community expectations".
WA now has the "toughest" sex offender legislation in Australia, he added.
He admitted it was probably "tougher than many lawyers and academics would like", as it allows the court to keep offenders locked up beyond their sentence.
The McGowan government quickly finished drafting the bill in September amid the release of several dangerous sex offenders, including a pedophile who once committed a sex offence while being driven away from prison where he had served time for other sex crimes.