VERY interested in your litter comments. I raced down onto my basement to read the fine print on my "WORLDS BEST CAT LITTER" bag. It is a corn based litter. The company, GPC PET PRODUCTS, is based in IOWA. One would assume that they would use local corn---but given the pet food situation--who knows what they use . Chinese corn??? HORRORS!!! Anyway, I am sure that local Iowa corn growers spray their fields. I intend to email the company and want assurances that I am not putting my cats at risk using their product. I want more than their word---I want proof. We took the pet food at their word and look where that got us. Do you know anything about this company GPC PET PRODUCTS?