In what is perhaps no great surprise, a 4 Corners investigation has discovered that the herbicide 24D contains elevated levels of dioxins. According to the report, the levels are the highest in 10-20 years and are potentially hazardous to health.
Dioxins are the class of chemicals found in Agent Orange and banned pesticides such as DDT.
The Australian industry regulator (the Australian Pesticides and Veterinary Medicines Authority or APVMA) says it has referred the test results on to the Office of Chemical Safety for assessment.
The ABC has the full story: http://www.abc.net.au/news/2013-07-22/four-corners-dangerous-dioxins/4833848