Forensic Physics: Evidence Collection and Pattern Analysis

This is the first of three hard premium mocks that complete the FACT Forensic Physics series. Coverage: evidence-collection discipline (Locard-driven cross-contamination control, multi-room scene management, document-examination sequencing, GSR sampling, casting protocols, photogrammetry, BNSS-compliant digital seizure), pattern-evidence analysis (bloodstain angle-of-impact and velocity classification, multi-impact glass-fracture sequencing with Wallner / 3R / cone-of-debris reasoning, tool-mark class-vs-sub-class-vs-individual characteristics, hair morphology and DNA strategy, ESDA-assisted document examination, footprint-to-stature regression, signature-fluency analysis), and forensic-engineering / criminalistics (NFPA 921 arc-bead vs fire-melted bead distinction under SEM, IS 269 cement adulteration, ASTM E1412 / E1618 ignitable-liquid identification, cyanoacrylate-plus-fluorescent-dye latent-print laser imaging, RBI-currency intaglio test, age-related signature variation, NHTSA Static Stability Factor for rollover analysis).

It is pitched at advanced MSc forensic-science students at NFSU, GFSU, LNJN-NICFS and other Indian universities, FACT and FACT Plus aspirants who want a stretching diagnostic before sitting the exam, and UGC-NET candidates calibrating their applied physics breadth. The questions deliberately push beyond the foundations and applied-analysis levels into the specific quantitative and methodological territory the FACT applied paper rewards. Pair with #6 (Foundations) and #7 (Applied Analysis) for the complete free build-up; this premium paper is the diagnostic stretch.

Topics covered:

• Multi-room scene-management and PPE / pathway discipline
• Document-examination sequence: photograph → ESDA → DFO → ninhydrin
• Outdoor wet-scene management with tarpaulin and gelatin-lifters
• ASTM E1588 GSR stub sampling protocol with control stub
• Tape-lifting with zonal mapping vs vacuuming vs scraping
• BNSS / IT-Act-compliant live triage + write-blocked imaging + hash recording
• Dental-stone footprint casting protocol with release agent
• SWGDE photogrammetric scaling with calibrated lens correction
• Suspected dowry-death scene-as-found protocol with knot preservation
• Bloodstain angle of impact (sin θ = w / l) and velocity classification (HVIS / MVIS / cast-off)
• Multi-impact glass-fracture sequencing using radial-termination, 3R rule, cone-of-debris, concentric-fracture rules
• Tool-mark class / sub-class / individual hierarchy
• Track-width + wheelbase to vehicle-class identification
• Hair: nuclear DNA from follicular tag vs mtDNA from shaft (HV1 / HV2)
• ESDA principle for indented-writing recovery
• Footprint-to-stature regression (foot length ≈ 0.15 × stature)
• Signature-simulation indicators (hesitation, slow line, tremor)
• Diatom test for drowning — bone-marrow sampling
• Building-collapse: IS 456 / IS 1786 / IS 13920 testing battery
• RBI counterfeit-currency intaglio relief test
• Aged-writer signature comparison and need for contemporary knowns
• NFPA 921 arc-bead vs fire-melted bead under SEM
• ASTM E1412 / E1618 ignitable-liquid residue analysis
• Cyanoacrylate + fluorescent dye + laser for difficult latents
• IS 269 MgO unsoundness and delayed expansive failure
• mtDNA HV1 / HV2 from telogen hair shaft
• Footwear class + individual identification with linear-cut individuating feature
• Latent-print recovery from fired cartridge cases (cyanoacrylate + dye + laser, or VMD)
• NHTSA Static Stability Factor for rollover-stability forensic conclusion

Each question carries a 220+ word structured explanation citing standard references (NIJ first-responder, BPRD SOPs, ENFSI guidelines, ASTM E1412 / E1588 / E1618, IS 269 / IS 456 / IS 1786 / IS 13920, AFTE / SWGTREAD / SWGDE, Bevel & Gardner BPA, Heard ballistics, Saferstein 12e, Sharma 5e, Hilton document-examination, RBI banknote-security manual, Bandey Fingermark Visualisation, Bodziak footwear and tyre, Robertson & Roux hair, Modi medical-jurisprudence, Foster + Freeman ESDA, NFPA 921, NHTSA SSF). Allow 30 minutes; explanations are dense enough to use as standalone study notes. Mocks #9 (Instruments & Spectroscopy) and #10 (Voice, Video & Reconstruction) complete the series.