What do we know about the significance of non-verbal cues in determining if a statement is true?

The Interview” by Douglas Starr
https://www.newyorker.com/magazine/2013/12/09/the-interview-7

Why does Kassin think that the Reid technique is inherently coercive?
Name one piece of evidence that proves it is easy to provoke false confessions? What do you think of that evidence?
What do we know about the significance of non-verbal cues in determining if a statement is true?
What is the PEACE technique? How does it differ from previous practices?
Imagine that a study finds that the PEACE technique leads to fewer false confessions but fewer convictions overall. Which one should be used?