The use of infrared cameras (thermal vision) as a contact-free method of lie detection is a subject as controversial as interesting, which can be attested by recently conducted studies. The article introduces the subject, explains the basic notions, and provides a historical outline. The studies mentioned in the article give hope for a more extensive application of infrared cameras for future lie detection. Certainly, possibility of remote observation of a subject, especially without the subject being aware, may result in problems of ethical and legal nature. What appears a crucial option in this area, however, is the possibility o f combining such a test with polygraph examination.