When you want pure estrous urine and nothing else, choose Code Blue&';s Doe Estrous Urine. Featuring Code Blues proprietary From One Deer to One Bottle process, where urine is collected from an individual deer, this product is guaranteed to be 100% pure. A buck can only trail one deer at a time, so with urine collected from a single doe in heat, you&';ll get unmatched true-to-life effectiveness that rutting bucks cant resist.