During an investigative interview or criminal interrogation, one of the most dangerous positions or mindsets to have is believing you are right when in fact you are wrong. The problem is, when someone has this mindset they don't know they have it because they believe they are right! Only at the end of the investigation, or unfortunately in many cases, 10 or 20 years after conviction, is it clearly evident to the individual that they were wrong.
The time to prevent this from happening is before conducting an interview or interrogation, and it all starts with training. Your training should not be a compilation of pseudoscience on deceptive body language indicators. You know, the so-called experts who "read" people and make blanket statements such as "they are lying because they scratched their head", or "they are lying because they looked away and answered the question" or "they are lying because they crinkled their nose." Are there things people do with their body, face, voice, tone, language etc. that may indicate they are lying? Absolutely. There are also things people do with their body, face, voice, tone, language, etc. that may indicate they are telling the truth as well. How do you tell the difference? With the right training!
Establishing a solid framework is a crucial component if you want to be effective and proficient when conducting interviews and interrogations. The BELIEF Interviewing model is just that; a solid framework for conducting highly effective interviews and interrogations, not only through establishing a procedural outline but also working on the psychology of the interviewer to prevent the issue of believing you are right when you are wrong!