This document contains the Supreme Court of India's judgment in Mohan Lal vs. State of Punjab. The case concerns an appeal against a conviction under the Narcotic Drugs and Psychotropic Substances Act, 1985. The judgment critically examines the investigation process, particularly when the informant is also the investigating officer, and its impact on fair trial principles. It is a crucial read for legal practitioners and those interested in criminal jurisprudence, especially concerning drug-related offences.