ACCUSED Nazi war criminal Charles (Karoly) Zentai -- who is fighting extradition to Hungary on charges relating to the alleged wartime murder of a Jewish man in Budapest -- has taken a lie detector test in an effort to prove his innocence.

Zentai took a polygraph test last week and claimed it found there was a 96 per cent likelihood that he was telling the truth regarding his alleged involvement in the death of Peter Balazs, 18, on November 8, 1944, in Budapest.

Zentai, 87, told the ABC's PM program he understood that polygraph tests were not admissible as evidence in court, but said it was something he needed to do.

"Everybody was throwing accusations at me. I was just getting tired of it all and I thought I had to do this," Zentai said.

The European-born Australian appeared before Justice John Gilmour in the Perth Federal Court on March 10 to appeal the court's previous finding that the Magistrates Court has jurisdiction to conduct his extradition trial.

His lawyers argued that murder was not considered a war crime in Hungary when Zentai was alleged to have killed Balazs.

His legal representative was reported to have argued that Hungary could apply to have the law enacted retrospectively, but had not done so.

Perth magistrate Barbara Lane ruled in 2008 that Zentai's case met the requirements of the Extradition Act and that he was eligible to be extradited to Hungary to stand trial.

But Zentai's lawyers argued the Magistrates Court did not have the jurisdiction to make the ruling on the Extradition Act.

Zentai's family have said, despite the cost of continuing legal proceedings fighting the extradition, they would continue to appeal the judgement.

The final decision on extradition is in the hands of federal Minister for Home Affairs Bob Debus.

After investigations through Israel's Simon Wiesenthal Centre, Australian authorities located Zentai in Perth in 2005, after which he was arrested and charged. The Hungarian Government consequently requested his extradition.

The Perth hearing is currently ongoing.

ajn.com.au