<prompt> Drug used in Narcoanalysis is:CocainePethidineAtropineScopalamine  <response>: Ref: Essentials of Medical Pharmacology by K.D. Tripat hi p. 109, 113.Explanation:Hyoscine ScopalamineAtropine substitute and quartemary ammonium compoundLess potent and longer acting than atropineUsed for esophageal and gastrointestinal spastic conditions.- Hyoscine has been used to produce sedation and amnesia during labour twilight sleep and to control maniacal states.- It had earned a reputation as a lie detector during world war SI: its amnesic and depressant action was believed to put the subject off guard in the face of sustained interrogation and sleep deprivation, so that he came out with the truth. 