Forensic Medicine: Bite Mark Analysis, ABFO Guidelines and Indian Admissibility

Bite mark analysis sits at the intersection of forensic odontology, clinical pathology, and evidentiary law. This mock covers the full UGC-NET Paper II Unit X scope: the ABFO 1986 Bitemark Standards and Guidelines, the five-tier ABFO classification system (definitive, probable, possible, improbable, exclusion), the ABFO No. 2 right-angled L-scale and its photogrammetric correction targets, perpendicular and oblique photography protocols, UV and IR supplementary imaging, the double-swab saliva collection technique for buccal epithelial DNA, Type IV dental stone casting, the transparent acetate overlay comparison method, distortion factors (skin elasticity and laxity, post-bite oedema, wound healing and contracture), and the scientific critique from the NRC 2009 Strengthening Forensic Science report and the PCAST 2016 report on forensic feature-comparison validity. Hard questions hinge on single-parameter distinctions: ABFO tier definitions that differ by one confidence criterion, scale design features (L-shaped vs circular vs flexible), and which report made which specific finding about foundational validity.

The Indian legal dimension is tested through Krishan Kumar Malik v State of Haryana (2011) 7 SCC 130, the Supreme Court judgment that established bite mark evidence as admissible expert opinion under Section 45 of the Indian Evidence Act, 1872 (now Section 39 of the Bharatiya Sakshya Adhiniyam 2023). The expert in that case was from AIIMS New Delhi, Department of Forensic Medicine, reinforcing AIIMS as the national reference centre for forensic odontology. Questions also test the deciduous (20 teeth) versus permanent (32 teeth) arch distinction and its role in child-abuse bite mark cases.

Topics covered:

• ABFO bite mark classification: definitive, probable, possible, improbable, exclusion
• ABFO 1986 Bitemark Standards and Guidelines -- photographic protocol
• ABFO No. 2 L-scale: right-angle geometry, grey patch, circular reference targets
• UV and infrared bite mark photography
• Double-swab saliva collection technique and buccal epithelial DNA
• Dental stone casting and VPS wash impression protocol
• Transparent acetate overlay and computer-assisted comparison
• Distortion factors: skin laxity, oedema, healing and contracture
• Krishan Kumar Malik v State of Haryana (2011) 7 SCC 130 and BSA Section 39
• NRC 2009 and PCAST 2016 critiques of bite mark validity

Allow 30 minutes.