Judges around the world are seeing error-riddled legal briefs that were generated with the help of artificial intelligence. A data scientist and lawyer has catalogued at least 490 filings in the past six months that contained false or misleading information from AI responses. His database is a cautionary tale for people learning to use AI tools at work. With many employers wanting workers to employ the technology, it's not just the legal profession that needs to be aware of the possible foibles. Legal and workplace experts suggest treating AI as an assistant whose work needs to be checked. They say users also need to be aware of privacy concerns.