Basics of Forensic Science: Applied Principles and Casework Concepts

This medium-level mock moves beyond definitions into application — the layer where students must understand why principles matter, how standards are applied, and what casework findings actually mean. All thirty questions require reasoning, not just recall, making this the bridge between the foundational easy mock and the critical-thinking hard mock.

Questions span Daubert vs Frye gatekeeping, the NAS 2009 core finding on validation gaps, the Henry Classification System mechanics (whorl values, numerator vs denominator), the Will West case and the fall of Bertillonage, blind ACE-V verification and the Mayfield lesson, the Kastle-Meyer test as presumptive (not confirmatory), ninhydrin chemistry (amino acids → Ruhemann's purple), crime scene documentation sequence (photograph → sketch → notes → collect), Section 45 IEA / Section 39 BSA scope, the Innocence Project and microscopic hair testimony, post-mortem redistribution (cardiac vs femoral blood), PCAST 2016 and bite-mark invalidity, corpus delicti doctrine, secretor status and FUT2, the four Daubert criteria (and what is NOT one of them), Section 51 BNSS replacing CrPC Section 53, OSAC under NIST, the likelihood ratio in Bayesian evaluation, the product rule (HWE + linkage equilibrium), investigative genetic genealogy, ACE-V inconclusive conclusions, Teichmann haemin crystals, Selvi v. State of Karnataka, interpreting negative forensic findings, low-template stochastic effects (drop-out and drop-in), forensic entomology ADD calculations, secondary transfer as a defence explanation, broken-seal chain-of-custody response, RMP vs proof of guilt, and Daubert's significance for forensic science.

Pitched at second-year BSc and first-year MSc Forensic Science students at NFSU and affiliated universities, FACT and FACT Plus aspirants, and UGC-NET candidates moving beyond foundational knowledge.

Themes covered:

• Standards: Frye vs Daubert gatekeeping, NAS 2009, PCAST 2016 (bite marks), OSAC under NIST
• Indian law: Section 45 IEA / 39 BSA, Section 51 BNSS, Selvi v. State of Karnataka, corpus delicti
• DNA: product rule (HWE + LE), RMP interpretation, low-template stochastic effects, IGG
• Fingerprints: Henry Classification mechanics, ACE-V blind verification, inconclusive outcomes
• Forensic biology: Kastle-Meyer (presumptive), ninhydrin (amino acids), Teichmann crystals, secretors
• Toxicology: post-mortem redistribution, cardiac vs femoral blood
• Scene and casework: documentation sequence, negative findings, broken seal, secondary transfer

Each question carries a detailed explanation citing Saferstein's Criminalistics, Buckleton's Forensic DNA Evidence Interpretation, Lee and Gaensslen's Advances in Fingerprint Technology, Gaensslen's Sourcebook in Forensic Serology, the NAS 2009 report, PCAST 2016, and primary Indian legal sources including the Selvi judgment and BNSS 2023. Allow 15 minutes.