However, Mr Andrews said anyone who felt they had been badly treated by police should file a complaint.

"Every case should be dealt with on its merits, every case should be properly and fully investigated, but it is a matter of fact that we've changed some of the standard operating procedures," the Premier said on Sunday.

"If there is anyone doing the wrong thing, there should be an investigation."

Police are working with the youth justice system and Department of Health and Human Services to ensure accurate reporting and investigation of complaints, a spokeswoman said.

"We know that many young offenders are vulnerable and at high risk of being victims of crime themselves," she said.