A Brisbane hospital service broke government guidelines while suing a former mental health patient for defamation. 

Brisbane Metro North spent 700,000 dollars on the private defamation case, but did not seek the approval of the Attorney-General, as required by guidelines. 

The guidelines were introduced after the Bjelke-Peterson-era to prevent officials from misusing public funds to potentially intimidate critics.

Greens MP Michael Berkman says the breaking of rules can’t be allowed to pass: "They're there to prevent officials from using public money to pursue and intimidate anyone who criticises them."