WASHINGTON, Nov. 16 — A discussion of recent threats to judges’ safety, at a bar association conference in suburban Dallas last week, became startlingly specific when Sandra Day O’Connor, the retired Supreme Court justice, recounted that each justice had received in the mail “a wonderful package of home-baked cookies” that contained “enough poison to kill the entire membership of the court.”

Justice O’Connor’s remarks were reported on Thursday in The Star-Telegram in Fort Worth.

Although the episode was not publicly disclosed when it occurred in April 2005, it had a public, although little-noticed, denouement last month when the sender of the poisoned cookies was sentenced in federal court here to 15 years in prison.

Image Sandra Day OConnor, the former Supreme Court justice, after an Iraq Study Group meeting at the White House on Tuesday. Credit... Michael Temchine for The New York Times

The sender, Barbara Joan March of Bridgeport, Conn., pleaded guilty to 14 counts of “mailing injurious articles.” The 14 recipients included the nine justices; the chiefs of staff of the Army, Navy, and Air Force; and the director and deputy director of the Federal Bureau of Investigation. The packages, containing either candy or baked goods, were laced with rat poison.