A murderer and a child sex offender have won the right to test WA's tough property confiscation laws in the High Court.

In separate cases, Gary White and Aaron Bowers had property seized from them after they were convicted of their offences.

The property was taken even though it had no direct link to the crimes they committed.

Gary White had $135,000 in a bank account frozen after he was jailed for life for murdering another man.

In the other case the state tried to seize the house of Aaron Bowers who was jailed for sexually abusing a teenage girl.

The barrister for Bowers, Malcolm McCusker QC says the High Court is expected to hear the cases early next year.

He says in the case of Mr Bowers, the property was jointly owned.

"Ultimately it would have confiscated the property which was jointly owned by Mr Bowers, which was about to be seized on a substituted basis which would have mean that his wife and two children, a wife suffering from cancer would have had no where to live."