A senior Gold Coast police officer committed to stand trial for perjury claims the investigation that led to her being charged was unlawful.
Michelle Stenner is accused of lying under oath during a Crime and Corruption Commission hearing.
She was committed to stand trial in 2018, but has since launched legal action against the state's watchdog, its chairman and the Queensland government.
In the Brisbane Supreme Court on Monday, barrister Jeffrey Hunter QC claimed the CCC chairman did not consider the most up-to-date material when an authorisation was issued for Stenner to appear before a closed hearing.
Mr Hunter argued the corruption watchdog's decision was not a lawful one and by extension, neither were the charges against her.
But CCC barrister James Renwick SC said it was merely a procedural matter.
"If the CCC is going to issue a notice to appear a decision needs to be made about whether it's a closed or open hearing," he said.
"That's all we're saying happened here."
Mr Renwick claimed the CCC chairman wasn't required to review all material collated during an investigation before he decided to question someone, but even if he were, the most recent information wouldn't have made a difference.
Justice Soraya Ryan will hand down her decision at a later date.
Australian Associated Press