Australia's mushroom industry says it is "absolutely impossible" that a grower could produce poison fungi.
Supermarket suppliers of mainstream mushroom varieties and exotic fungi producers argue they operate to the highest safety standards, and there is no chance toxic mushroom varieties could wind up in stores.
The industry is defending its supply chain standards after a woman who prepared a fatal lunch containing suspected toxic mushrooms at Leongatha told police they were purchased, not foraged.
The ABC has revealed Erin Patterson, 48, told police the fungi she used in the beef Wellington dish fed to her lunch guests on July 29 were a mixture of button mushrooms from a major supermarket and dried mushrooms from an Asian grocery store in Melbourne.
Read more at abc.net.au