I see some people use it as a preventative, some use it only after their chickens have already gotten lice. I've read that it can be dangerous for people with asthma and not to use it around children. So whats the dealio? Should I be using this in my chickens dust baths or not? It seems like a good idea to prevent bugs, but I have asthma and I have a 9 year old in with the chickens daily. I know that if the coop is well ventilated it "shouldnt" be a problem.. but I would rather be safe than sorry. Maybe Ive been reading articles about Non food grade DE and Food grade DE and thats whats confusing me? .. Is FG safer to be around and breathe in if it were to dust up? ***Can anyone provide some links to studies or articles?