Sorry, I guess I should check the date and didnt realize it was a poster problem specific. I was thinking maybe other people who currently have this problem might read this thread. I know I read older threads if they have helpful suggestion. In fact I read lots of threads before registering.
Another important thing if you are thinking of culling the offender and you think you have figured out who the culprit is, you have to get them quick...other chickens watch and learn.