this sort of thing is entertaining, if not scientifically accurate: https://www.bodylanguagesuccess.com/201 ... trump.html
REPORTER (beginning at 1:02:39): A question for President, President Putin. Ah, two questions for you, sir. Can you tell me what President Trump may have indicated to you about officially recognizing Crimea as part of Russia? And then secondly, sir, do you, does the Russian government have any compromising material on President Trump or his family?
• Nods his head up-and-down
• Displays a false smile (this variety of false smile is known as a "Bitter Smile")
• Closes his eyes
• Looks down to his right
• Looks over to Putin
• Moves both hands and arms from a position front and forward on the lectern, to a retracted and back configuration
• Nods his head side-to-side (as Putin chuckles)
• Blushes deeper (as Putin chuckles)
• Looks to Vladimir Putin again for an answer (note he does this twice)
Blushing with a suppressed smile alone would be enough - yet this set of nonverbal dynamics, clustered together in this context is PROFOUNDLY indicative of guilt. His blushing comes in a second wave precipitated by the Russian President's laughter/chuckling.
SUMMARY: After detailed nonverbal analysis of this portion of the Trump-Putin press conference, the findings strongly support the allegation that the Russian government has "compromising material" (what the Russians call, "kompromat") on Donald Trump and/or his family. Statement analysis also indicates both men are being deceptive. It's extremely probable that President Trump is being blackmailed.
the guy's findings always seem to confirm what he wants to find, but trump did look mildly like a deer in headlights during that question.