Several cases cited in a legal filing against Colombian airline Avianca were "hallucinated" by ChatGPT, resulting in ridicule for the lawyer bringing the case.

According to the New York Times, Avianca customer Roberto Mata sued the airline after a serving cart injured his knee during a flight, only for his lawyer, Steven Schwartz of Levidow, Levidow & Oberman, to use ChatGPT to 'supplement his own findings. 

The bot returned six legal cases, including 'Varghese v. China Southern Airlines Co., Ltd', all of which it claimed were real but turned out to be fake.

Schwartz later said he was 'unaware of the possibility that [ChatGPT's] content could be false.'  

The judge ordered (pdf) another hearing to 'discuss potential sanctions' for Schwartz in response to this 'unprecedented circumstance', and decided to fine the two lawyers USD 5,000.

The incident resulted in questions about the accuracy and marketing of the OpenAI system, and was seem to make the lawyer and his employers appear unprofessional and out of touch.