There are concerns over the welfare of the calves used in professional rodeo, and the industry itself polices events closely, penalizing competitors who "jerk down" a calf with the rope or flip it over backwards. Dr. Eddie Taylor stated that in 16 years as an attending veterinarian at PRCA rodeos in Arizona, "I personally have not seen a serious neck injury to a tie-down roping calf." Statistically, the rate of injury to the animals is relatively low. In 1994, a survey of 28 sanctioned rodeos was conducted by on-site independent veterinarians. Reviewing 33,991 animal runs, the injury rate was documented at 0.047%, or less than five-hundredths of one percent.