Continue your study, and you will find that the opposite is something few people can hide. Sure politicians like the Clintons (and even Trump..... He is a master of this because he does it in such a seemingly open and naïvely honest-appearing way that it tends to disarm opponents.) will use some things to their advantage, but even they often do not realize they are also unwillingly giving off a multitude of other signals that reveal the truth of their true thinking.