Buck urine taken from a single whitetail deer for the "true-to-life" effectiveness. Every 1-ounce bottle is certified as the "genuine article" by an independent organization and marked with the deer's registration number.
Each bottle of Code Blue contains secretion from one individual deer. This means two hunters in the same woods will always have two distinctly different scents from two different individual animals. If one of the hunters spooks a deer, he will not hinder the success of the other's hunt, because the deer will not associate the different scent with the scent that was present where it was spooked.