Last fall, school administrators at the University of Yucatán asked Abraham Slim, a 23-year-old medical student, to fill out a survey on his smartphone. The questions on the survey did not relate to his subjects but probed into his mental health. They asked if he had “started to work out the details of how to kill” himself the previous month, and if he “intended to carry out this plan,” among other queries. The questionnaire was part of an artificial intelligence-backed mental health care initia...