complaints i'm sure like i have, they complain of burning in their sinuses, in their throat, lightheadedness, nausea, headaches. what is that? is that exposure to the toxic elements? >> regarding the symptoms that we're seeing, we don't have a good explanation. >> does it surprise you that there's not a good explanation, because what a lot of people are telling, are saying, is look, we're smelling the stuff, we don't feel well afterwards. we are exposed to this stuff. >> they do come in and we do evaluate them. and we do treat them. and assure that there hasn't been any ill effect from a chemical out there. sometimes we can't explain why. >> reporter: there are gray areas of medicine. >> absolutely. yes. >> reporter: you know that probably better than anybody. with regard to testing. if someone comes in with any kind of complaint, are you just getting baseline blood testing or are you only doing it in cases where you're strongly suspicious? >> we do in the have any set protocol out there so we rely on