I know that many physicians really tire of any kind of mention of toxic exposures to common chemicals. But, of course, in farm areas of the country you have organophosphate fertilizers,neurotoxic pesticides (that is there mode of action), and Malathion from mosquito sprays. History has shown some interesting panics from say rye bread with mold containing a substance with LSD So, really this is an old problem (think also the lead in Rome). These historic things had qualities of mass hysteria. I am now researching an idea that groups of psychotic people may have both probably a genetic disposition and common exposures to these chemicals. In Michigan, there are incredible levels of various chemicals from PBB's to Dioxins. My question, to anyone, without knowing the specific chemicals to test for can you use a GC or other biological markers to test for these exposures? In areas of mass psychosis could there be preventive medical analysis? If so, how? If so, how would you get the word out? I'm concerned that no one would want to panic these already psychotic persons. Good point but maybe there is a "new" thing like the problems with the citrus herbicide here. Farms are not get away places but are now a real cornucopia of a chemical soup (additive effects) Cathy.