For CIA officer Andrew Bustamante has many videos on YouTube. This one has a segment on how to lie to someone. Between 39 and 50 minutes (starting at about the 39:07 mark), he mentions mimicking someone to build trust and other body language tactics to successfully lie to someone. Shifting your body could be a sign of lying. Can these methods be used to pass a polygraph? Mimic the polygrapher?
https://www.youtube.com/watch?v=QVVe2rCHtN0&t=39m07s