Almost one in five lawyers are using AI, according to an American Bar Association survey. But there are a growing number of legal horror stories involving tools like ChatGPT, because chatbots have a tendency to make stuff up — such as legal precedents from cases that never happened. Marketplace’s Meghan McCarty Carino spoke with Daniel Ho at Stanford’s Institute for Human-Centered Artificial Intelligence about the group’s recent study on how frequently three of the most popular language models from ChatGPT, Meta and Google hallucinate when asked to weigh in or assist with legal cases.