A further four synthetic cannabis substances have been banned and any products containing them must be removed from commercial sale immediately from today.
Associate Health Minister Peter Dunne has announced 28 substances were now banned under Temporary Class Drug Notices since they were introduced under an amendment to the Misuse of Drugs Act in August last year.
Under the notices more than 50 synthetic cannabis products removed from the market.
The latest substances to be banned are the chemicals CB-13, MAM-2201, AKB48 and XLR11.
"I am informed that all these substances have recently been identified in powders investigated by ESR. CB-13 was also identified separately by ESR in a synthetic cannabis product called Tai High,"Mr Dunne said.