Several months ago, Dr. Andrew Clark, a psychiatrist in Boston, learned that an increasing number of young people were turning to AI chatbot therapists for guidance and support. Clark was intrigued: If designed correctly, these AI tools could increase much-needed access to affordable mental-health care. He decided to test some of the most popular bots on the market, posing as teenage patients in need.  The results were alarming. The bots encouraged him to “get rid of” his parents and to join