A lot have been done, because these were the sorts of things that were used in sheep dips and things like that, where you had exposures among farmer populations. So there's a long toxicological knowledge of the effects of exposure.
Similarly they had a problem in the Gulf when they were trying to grow their own crops in the desert in the United Arab Emirates. People were using fertilizer, but fertilizers and pesticides had the same name in Arabic, I think, being translated as chemicals. So people were putting huge quantities of organophosphates onto the food crops, thinking they were fertilizers. I think there were problems there as well.
There is a body of knowledge on the toxicity of these types of things. I'll be honest with you. Within the U.K., and possibly within Canada and the United States as well, there has been more emphasis on saying that it's not uranium than on trying to work out what caused it. That's a personal opinion.