I am in the process of finishing up my coop. When I bought lumber, the man advised me to use the treated wood as it would last outside. When I realized it was treated with chemicals, I began to worry that it would hurt my chickens. Is this going to be safe? I am worried that even if it doesn't leach into the ground, then the chickens might peck at it. I can't find a clear answer on whether or not it will hurt them!