About a year ago at Erlanger Baroness, the largest hospital in Chattanooga, anesthesia staff noticed that a nurse was slurring his words and struggling to stay awake while on duty in the surgery center, according to a Tennessee Board of Nursing consent order. In the days that followed, the nurse failed a drug test and was fired, the order states. The nurse later admitted that for months he had pilfered and abused fentanyl left over after surgeries, sometimes daily, according to the order. Under most circumstances, this would be a routine case of what is known as "drug diversion," the...