Questioned Document: Anonymous and Disguised Writings Analysis

This mock tests mastery of the forensic analysis of anonymous and disguised writings, covering linguistic authorship attribution (idiolect, sociolect, register), handwriting disguise methods (slant change, hand change, block-letter adoption, mimicry), indicators of disguise fatigue, habitual features that persist through deliberate concealment (terminal strokes, diacritic placement, spacing rhythm), stylometry fundamentals (function-word frequency profiles, type-token ratio, sentence-length distribution), and computer-assisted forensic stylometry including CUSUM, the Burrows Delta method, and character n-gram models. Landmark cases including the Unabomber manifesto linguistic analysis and the JonBenet Ramsey ransom note are examined alongside the admissibility framework under Section 39 of the Bharatiya Sakshya Adhiniyam (BSA) 2023, which replaces Section 45 of the Indian Evidence Act 1872.

Anonymous and disguised writings present a core challenge in Indian forensic practice. The Questioned Documents Division at CFSL Kolkata handles a substantial volume of anonymous threat letters submitted by investigating agencies, and examiners apply both handwriting comparison and linguistic profiling methods to address authorship questions. The graduated CFSL opinion scale (conclusive identification, probable authorship, possible authorship, inconclusive) and the procedural framework under Section 336 of the Bharatiya Nagarik Suraksha Sanhita (BNSS) 2023 governing submission of government scientific expert reports without oral testimony are tested at the application level in this mock.

Topics covered:

• Anonymous letter analysis: linguistic and handwriting feature integration
• Forensic linguistics: idiolect, sociolect, and register as authorship markers
• Disguise methods: slant change, hand change, block-letter adoption, mimicry
• Indicators of disguise: intra-word slant inconsistency, mixed script style, disguise fatigue
• Habitual persisting features: terminal strokes, diacritic placement, spacing rhythm
• Stylometry: function-word frequency profiles, TTR limitations, sentence-length distribution
• Computer-assisted stylometry: CUSUM, Delta method, character n-gram models
• Threat assessment and admissibility: BSA Section 39, BNSS Section 336, CFSL opinion scale

Allow 30 minutes.