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Federal prosecutor Terri K. Flynn said of the message, "It was written in grapefruit juice. And pretty much, you write it in a Q-tip or toothpick, and then the back of it is heated up, and the message becomes visible."

Prosecutors asked for the death sentence for Mills and Bingham, but the jury deadlocked on that part of the case, and so both face automatic sentences next week of life without parole.

A report by the Justice Department's inspector general found the Bureau of Prisons "is unable to effectively monitor the mail of terrorist and other high-risk inmates in order to detect and prevent terrorism and criminal activities."

Federal prosecutor Terri K. Flynn said of the message, "It was written in grapefruit juice. And pretty much, you write it in a Q-tip or toothpick, and then the back of it is heated up, and the message becomes visible."