The most comprehensive outline on the industry wide quality system which is implemented through the registration of the chemicals used, the prescription of how these chemicals may be used and the requirement to undertake training to be able to use agricultural chemicals is available on the Office of the Environment and Heritage website at the following link: http://www.environment.nsw.gov.au/pesticides/pestmmngngnsw.htm
The NSW DPI has a fact sheet which outlines the process of residue testing which is available online at http://www.dpi.nsw.gov.au/__data/assets/pdf_file/0010/186391/residues.pdf
The Food Standards Australia and New Zealand undertake an Australian Total Diet Survey, with the last survey (no 23) containing the following findings:
Given the estimated dietary exposures for all 46 agricultural and veterinary chemicals were below respective ADIs at the 90th percentile, there are no public health and safety issues associated with current dietary exposures to agricultural and veterinary chemical residues in food for the Australian population. This finding is consistent with the results of the 19th and 20th ATDS (FSANZ, 2001; FSANZ, 2003).