Words are the steak of communication. Non-verbal behavior, emotions, facial expressions, and tonality are the seasoning. Words are the primary carrier of communication. Don’t believe that 7% deal from 50 years ago. Even the original researcher was clear that his theory was limited to his research paradigm involving liking or disliking something.
Too many people are trying to learn about seasoning but they miss the main meal! Spend time learning what language can tell you about truth and deception. Learn how to communicate effectively and build rapport with people. Learn how to question people properly and enhance their memory rather than distort it. Learn how memory works. Learn what truth looks like. Learn, or unlearn, what behavioral indicators may indicate deception. Learn how your mind hears what it wants and misses what it needs…and learn how to overcome that dilemma. Learn the difference between a strong and weak denial. Learn what commitment in language looks like and understand how and why people may veer from it. Learn the power of “I” and how important “we” may be in crimes. Learn to listen…really listen to people. Learn to find the holes in a person’s story and how to effectively evaluate the significance of them. Learn how people try to conceal their lies through language without realizing that the language they use highlights their lies. Learn that “didn’t” and “wouldn’t” are not the same, which is true of “never” and “no” as well.
And lastly, not only do you have to learn how to identify deception effectively, you also have to know how to get them to the truth. This is just a fraction of information about the steak (words/language) that you need to learn to be a highly proficient interviewer or interrogator. Once you have that as a solid skill-set, then you should start learning about the seasoning (body language, microexpressions, totality, etc), but not before. If you worry about or pay too much attention to the seasoning but you don’t know enough about the steak, you may end up going hungry!