Judicial system, particularly the criminal justice system, is not untouched with the advancement of science. A volcano has emerged in the age old laws of crime detection (investigation), long established laws of evidence and criminal jurisprudence with the introduction of new techniques Detection of deception like Brain Mapping, Narco-Analysis, Hypnosis, and Polygraph Test. These advanced crime detection tools has emerged as the most powerful branch in forensics. Narco analysis is steadily being mainstreamed into investigations, court hearings, and laboratories in India. However, it raises serious scientific, legal, and ethical questions.