Counsel. "How many years ago, on your oath?"
Witness. "Fifteen, probably."
Counsel. "Any others?"
Witness. "Yes, one other."
Counsel. "When?"
Witness. "Twenty years ago."
Counsel. "Are these three cases all you can remember in your experience?"
Witness. "Yes, sir."
Counsel (chancing it). "Were more than one of them deaths from morphine?"
Witness. "No, sir, only one."