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County Superior Court Judge Susan J. De Witt declined to release Matarico, who remains jailed in lieu of $590,000.

De Witt also granted a request for a protective order barring Matarico from speaking to the teen or going near his home or school.

University of Oxford researcher Christian Schroeder de Witt, Carnegie Mellon University researcher Samuel Sokota and their colleagues used an AI program to create innocent-looking chat messages with secret content.

To outside observers, the chat is indistinguishable from any other communication made by the same generative AI: “They might detect that there is AI-generated content,” Schroeder de Witt says, “but they would not be able to tell whether you've encoded secret information into it.”

Strohmeier was making a casual comment, but Sokota and Schroeder de Witt took it seriously.