And if it does get better, should we still be doing frequent air and water testing or anything that would give us an answer that it's getting better? and should we be testing -- >> go ahead and finish your question. >> should we be testing surfaces, as well? i'm not sure if they attach to surfaces or if a special cleaner would have to be presented. >> right, right. so there is a couple of levels of question there, so you mentioned that the chemical could still be in town. i say that there are probably multiple chemicals, and that's one of the sort of difficulties, is we don't know which specif...