somehow I think it possible to tell if someone is ***, but it is **** to tell what it is that makes someone look *** (unless of course, someone wears *** symbols), so it is very **** to answer this question. so maybe it is not really possible. once u know someone is ***, u can always find something that makes him or her look ***. so actually one should so a test by 'guessing' whether someone is *** and see how often u are wrong or right