Can a fortune teller see that others are cheating?

From a scientific point of view, if fortune tellers can accurately predict the results, then they don't have to rely on it to make a living in the street. Of course, if he is good at reading people's minds, he may be able to test the results by contacting people who have cheated. Anyway, metaphysical divination does not exist, and we can't expect to get results in this way. Correct divination is either blind cat meets dead mouse or reasoning based on psychology and behavior, so please be rational.