The Commonwealth Health portfolio has responsibility for overseeing genetically modified organisms (GMOs) in Australia and does this through the Office of the Gene Technology Regulator (OGTR).
Before any new GM crops are brought to market they are thoroughly evaluated for environmental safety on a case-by-case basis by the regulator. The OGTR is required to seek advice and comments from the Minister for the Environment, the public, scientists and various regulatory agencies, including Food Standards Australia New Zealand.
(Taken from: http://www.csiro.au/pubgenesite/faqs.htm)