Expert witness used Copilot to make up fake damages, irking judge
Judge calls for a swift end to experts secretly using AI to sway cases.
A New York judge recently called out an expert witness for using Microsoft’s Copilot chatbot to inaccurately estimate damages in a real estate dispute that partly depended on an accurate assessment of damages to win.
In an order Thursday, judge Jonathan Schopf warned that “due to the nature of the rapid evolution of artificial intelligence and its inherent reliability issues” that any use of AI should be disclosed before testimony or evidence is admitted in court. Admitting that the court “has no objective understanding as to how Copilot works,” Schopf suggested that the legal system could be disrupted if experts started overly relying on chatbots en masse.
His warning came after an expert witness, Charles Ranson, dubiously used Copilot to cross-check calculations in a dispute over a $485,000 rental property in the Bahamas that had been included in a trust for a deceased man’s son. The court was being asked to assess if the executrix and trustee—the deceased man’s sister—breached her fiduciary duties by delaying the sale of the property while admittedly using it for personal vacations.