The Lightman Group is a private company set up by psychologist Dr. Cal Lightman. It serves as an independent contractor in assisting federal agencies, local police, corporations and private individuals with their most difficult cases, reaching the truth through applied psychology: interpreting microexpressions (through the Facial Action Coding System) and body language in order to tell when a subject is lying. The company was founded by Dr. Lightman and Dr. Gillian Foster after Lightman left the deception detection program that he founded for the United States Department of Defense.