As Doris listened to Dr. Spears illustrate the case, she carefully recalled her father’s activities and said, “Dr. Spears, I have never seen my father take any unknown drugs after his illness worsened nor did I see him take any traditional medicine, let alone Dutchman’s pipe.”

Then, she added, “Overall, he was in excellent health after his last kidney transplant with a relatively mild form of diabetes, so he had been taking metformin extended-release tablets, but that drug does not do harm to t