I thought this would be a nice topic.
I remember being on my first ODA I was given a book on body Language. Great things to know.
Watch "History Channel Secrets of body language 720p" on YouTube
https://www.youtube.com/watch?v=dW9z...e_gdata_player
I know there is one given to police officers which if anyone knows or it post.
You also have the courses ran by Reid Institute, like their interview and interrogation training.