For some time now, a set of scientists has been glorifying the "magic" of a "truth serum". They insist it can make hard-core criminals talk and spill the truth about their misdeeds. Medical professionals are often involved in experiments, for many decades now, with the various technologies that are used in "lie detection", including brain mapping (polygraph and functional magnetic resonance imaging) and the so-called truth serum (use of sodium pentothal) in narco-analysis.