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By:

Dr. Keshav Kumar & Hemanth Sai Reddy

19 June 2025 at 2:30:46 pm

Beyond the ‘Truth Serum’

Narcoanalysis is often sensationalised as a “truth serum”, but in reality, it is a scientific investigative aid grounded in neuroscience and forensic psychology. In an era where crime has become increasingly sophisticated, law-enforcement agencies are compelled to rely on science as much as instinct. Among the most debated tools in this scientific arsenal is narcoanalysis, often sensationalised as a “truth serum” test. While critics question its ethics and reliability, narcoanalysis, when...

Beyond the ‘Truth Serum’

Narcoanalysis is often sensationalised as a “truth serum”, but in reality, it is a scientific investigative aid grounded in neuroscience and forensic psychology. In an era where crime has become increasingly sophisticated, law-enforcement agencies are compelled to rely on science as much as instinct. Among the most debated tools in this scientific arsenal is narcoanalysis, often sensationalised as a “truth serum” test. While critics question its ethics and reliability, narcoanalysis, when applied lawfully and scientifically, has proved to be a valuable investigative aid, particularly in complex and deadlocked cases. Narcoanalysis involves the controlled administration of barbiturates such as sodium pentothal (sodium thiopental), sodium amytal, or similar drugs that depress the central nervous system. These substances induce a semi-conscious state in which higher cognitive inhibitions are lowered. The scientific premise rests on neuroscience and psychology: when cortical control is suppressed, a subject becomes less guarded, allowing spontaneous verbalisation of memories that may be consciously suppressed during conventional interrogation. Trained forensic psychologists, assisted by anaesthesiologists, conduct questioning in this altered mental state, ensuring medical safety and procedural discipline. From a neural and philosophical standpoint, narcoanalysis recognises the layered nature of human cognition. Memory is not always accessible through conscious recall; fear, guilt, or trauma often block truthful disclosure. By chemically reducing mental resistance, narcoanalysis can allow access to subconscious recollections. India’s experience with narcoanalysis includes several high-profile criminal investigations. In the Nithari serial killings case, narcoanalysis of the accused reportedly helped investigators reconstruct timelines and locate corroborative evidence when the probe had reached a standstill. Similarly, during the Telgi fake stamp paper scam, narcoanalysis was used to unravel the scale of the conspiracy and identify critical links, leading to further recoveries and arrests. In cases involving organised crime and terrorism, the technique has often served as a breakthrough mechanism. The judiciary has acknowledged this investigative utility while firmly drawing constitutional boundaries. In Selvi & Ors. v. State of Karnataka (2010) ,  the Supreme Court held that   involuntary narcoanalysis is unconstitutional, as it violates the right against self-incrimination under Article 20(3) and the right to personal liberty under Article 21. However, the judgement did not discard narcoanalysis altogether. Instead, it carved out a lawful space for its voluntary use, subject to strict safeguards. The Court clarified that narcoanalysis may be conducted only with the free, informed consent of the subject,   recorded before a judicial magistrate, with access to legal counsel and full disclosure of medical and legal consequences. Crucially, while statements made during narcoanalysis are not admissible as evidence ,  the court recognised that facts discovered as a result of such statements may be admissible, provided they are independently verified. Thus, if narcoanalysis leads to the discovery of a weapon, location, or material fact, and such discovery is corroborated independently, it can assume evidentiary value not because of the statement itself, but because of the factual discovery it enables. Indian courts have, on occasion, acknowledged the relevance of scientific interrogation techniques. The Bombay High Court, in cases such as  Ramchandra Ram Reddy v. State of Maharashtra , emphasises narcoanalysis and related forensic tests as necessary modern investigative tools, provided they are conducted ethically, scientifically, and under judicial oversight. While courts remain cautious, there is judicial appreciation of science-led investigation when constitutional safeguards are respected. Institutions such as the Directorate of Forensic Science Services (DFS) and Gujarat FSL have further strengthened the credibility of narcoanalysis by developing it within a forensic psychology framework, adhering to international medical and ethical standards. Their work demonstrates that narcoanalysis, when conducted by experts rather than interrogators, can align with both science and law. Narcoanalysis is neither a magic wand nor a mediaeval coercive practice. It is a scientific investigative aid, meant to supplement—not supplant—traditional evidence. Used voluntarily, cautiously, and professionally, it can illuminate investigative paths otherwise hidden. In the balance between civil liberties and societal interest in justice, narcoanalysis deserves not dismissal but disciplined acceptance within the rule of law.   (Kumar is a former IPS officer and forensic consultant to Assam government. Reddy is Forensic Psychologist & Corporate Security & Loss Prevention Executive. Views personal.)

Choking Mumbai

For decades, Mumbai was perceived as a rare urban oasis, where the saline sweep of the Arabian Sea blunted the worst ravages of India's air pollution. That illusion has now been dispelled. A meticulous four-year study by Respirer Living Sciences (RLS), using data from its AtlasAQ platform, reveals the bleak truth that the city’s air is thick with pollutants all year round, with no ‘clean season’ left.


Mumbai’s annual average levels of PM10 (particulate matter ten microns or less in diameter) have consistently breached the national safety threshold of 60 micrograms per cubic metre (μg/m³). This is not merely a seasonal malaise tied to cooler winter months, as once assumed. Alarmingly, the city’s pollution levels persist even through the hot season, a time when improved atmospheric dispersion should offer natural reprieve.


Across the city - from Chakala in Andheri East to Deonar, Kurla, Vile Parle West and Mazgaon - pollution has become an unrelenting, ubiquitous presence.


The culprits are well known: traffic emissions from a burgeoning number of vehicles; unregulated dust from frenzied construction; industrial activity in and around the ports; and a conspicuous lack of dust control measures. Mumbai’s ceaseless growth now risks becoming a chronic liability.


Worryingly, the regulatory response remains sluggish. Mumbai’s urban planning continues to treat clean air as a peripheral concern, not a foundational necessity. Development plans rarely integrate environmental impact assessments in a meaningful way.


A sharper, citywide strategy is urgently needed. Dust suppression rules at construction sites must be enforced strictly, with financial penalties for violators and incentives for best practices. Traffic management systems should be overhauled to ease congestion and encourage the use of public transport. Expansion of clean, reliable mass transit network needs to be urgently prioritised. In addition, comprehensive real-time air monitoring at the ward level should be deployed, enabling authorities to respond to localised pollution spikes swiftly rather than relying on citywide averages that conceal dangerous hotspots.


Longer-term, clean air targets must be hardwired into the city’s master planning and transport policies. Green buffers along major traffic corridors, stricter emission norms for commercial vehicles and incentives for rooftop gardens and urban afforestation could all play a part. Industrial zones near port areas should be subjected to rigorous air quality compliance measures, not token self-certifications. Private developers and large infrastructure firms, often among the worst offenders, must be made stakeholders in the clean air mission through binding regulations.


Mumbai’s commercial dynamism - as a magnet for migrants, entrepreneurs and investors - depends not just on glittering skyscrapers but on something far more basic: the ability to breathe. Unless clean air becomes an unshakeable priority, the city risks suffocating its own future. For a metropolis that prides itself on its resilience against terror attacks, monsoon floods and economic shocks, the real test will be whether it can muster the will to fight an invisible, pervasive enemy slowly corroding the lives of its 20 million citizens.

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