From a story on politico.com by Joe Navarro headlined “8 Tips for the Debate Stage From a Body Language Expert”:

The GOP primary candidates were open books at their first debate in August — if you knew how to read them, that is.

As an expert who’s studied nonverbal communication for over 50 years, 25 as an FBI agent specializing in decoding human behavior, I saw through the canned speeches to the real men and women on the debate stage. Ron DeSantis’ furrowed glabella, Vivek Ramaswamy’s bright smile, Nikki Haley’s tensed jaw — these telltale bits of body language revealed their inner thoughts with an immediacy and authenticity that words could never achieve.