For whitetail, there is only one FDA approved method: remove the head, use special too to remove the brainstem, place same in culture for period of time, test culture. At the same time, one pair of the four lymph nodes in the head is removed. One goes along with the brainstem, the other goes into a test that has been approved for mulies. This method is quicker, but not yet approved for whitetail. In either case, the lab doing the testing must be FDA approved.