This book offers a comprehensive and accessible examination of three pivotal scientific techniques employed in modern criminal investigation and interrogation: Narco-Analysis, the Polygraph (Lie Detector) Test, and BEAP (Brain Electrical Activation Profile).

Tracing the origins of truth-seeking methods from the ancient Latin maxim in vino veritas—”truth in wine”—to the contemporary use of sodium pentothal, the book unpacks the science and history behind narco-analysis. Derived from the Greek word narke meaning “numbness,” this psychotherapeutic and interrogative technique induces a state of controlled unconsciousness, based on the premise that lying demands greater cognitive effort than truth-telling, making deception harder when cortical function is suppressed.

The book further explores the polygraph test, detailing how physiological markers such as blood pressure, heart rate, respiration, and skin conductivity are monitored to detect the involuntary nervousness associated with deception.

Beyond these interrogation techniques, the book delves into the evidentiary role of DNA fingerprinting in the criminal justice system—its critical applications in resolving cases of rape, baby exchange, paternity disputes, and immigration matters, as well as its power to exonerate innocent suspects and distinguish between copycat and serial crimes through cross-scene sample analysis. A foundational discussion on the nature and necessity of expert evidence precedes the detailed treatment of DNA evidence admissibility in court.

Blending scientific explanation with legal relevance, this book serves as a valuable resource for students, legal practitioners, law enforcement professionals, and anyone seeking to understand the intersection of forensic science and criminal justice.

Table of Contents:

1. Introduction
2. Brain Fingerprinting
3. D.N.A. (Deoxyribonucleic Acid)
4. Narco-Analysis Test
5. Lie Detector Tests
6. Narco-Analysis — Criminal’s Privacy versus Society’s Necessity
7. Fingerprint Evidence
8. Expert Evidence
9. Cyber Forensics
10. First Information Report
11. Non-Cognizable Cases and Police Investigation
12. Ballistic Expert Report
13. Birth During Marriage, Conclusive — Proof of Legitimacy
14. Murder
15. Circumstantial Evidence
16. Medical Evidence and Ocular Evidence
17. Ante-Mortem Injuries and Medico-Legal Aspect
18. Post-Mortem Examination
19. Forensic Autopsy
20. Concept of Toxicology
21. Inquest Report — Inquiry into Cases of Sudden Unnatural Deaths, Suicides, etc.