“Body language analysis” was invented as a psy-op to make polygraphs appear scientific by comparison
I do feel kinda weird about this stuff re: forensic/investigative woo because like, ask me, I can quite often tell when someone’s lying by how they move their eyeballs when they’re talking.
(and that when I’m manic I can effectively read their thoughts if I know them well enough, because I can construct a sufficiently detailed model of their mind, figure out how it would respond to various stimulus if certain facts were true, how those responses would manifest in outwardly observable signs, and if those signals aren’t coming off what those that are correspond to)
But even then, could I fit those insights to a theoretical framework extensible and applicable in scale that I could then train others in through circulating literature or hosting professional development seminars such that any given student pursuing training could be certified as competent to apply them to any given situation and have their analysis be taken as a legitimate basis for establishing truth in a court of law? No the fuck I could not.