IS IT POSSIBLE to tell whether someone is a criminal just from looking at their face or listening to the sound of their voice? The idea may seem ludicrous, like something out of science fiction — Big Brother in “1984” detects any unconscious look “that carried with it the suggestion of abnormality” — and yet, some companies have recently begun to answer this question in the affirmative. AC Global Risk, a startup founded in 2016, claims to be able to determine your level of “risk” as an employee or an asylum-seeker based not on what you say, but how you say it.