The interpretations assigned to facial expressions vary greatly, so we need to be careful when using them. Our instructor-led training programs involve a combination of didactic, individual- and group-based participatory exercises.
Facial expressions of emotion are not culturally universal
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Individuals and organizations with interests in detecting lies have used programs we have developed that are based on information that has been substantiated in scientific research and informed by law enforcement Facial expressions in non observed in the real world by officers and agents who have worked with us.
Facial Expressions – The Art of Non-verbal Communication
Facial expressions—including fear—may not be as universal as we thought
By Efrat K Cohen.
Facial expression - Wikipedia
Role of facial expressions in social interactions
Facial Expressions and Non Verbal Comunication - ScienceDirect