[ABC 22 July 2013] -- In the 1980s and 1990s governments across Australia outlawed the use of the herbicide 245T. The ban was introduced for one very good reason - 245T contains dioxin, a chemical impurity with the potential to seriously harm people who are exposed to it. But has the dioxin menace been tamed? Four Corners reveals evidence that this potentially deadly chemical compound may still be present in weed control products and that authorities do not routinely test for it. The program also reveals that this hands-off approach to regulation is entirely in keeping with the way governments have dealt with the lethal chemical dioxin over four decades. In the 1960s and 70s the solution used in weed eradication often involved the spraying of herbicides 245T and 24D. Both substances contained dioxin. It was common practice for workers, in many parts of the country, to decant the herbicides from large drums into backpacks to apply the chemicals. In many cases they sprayed the liquid without using proper protective clothing.