ForensicSpot10 modules
Forensic Chemistry
The analytical chemistry of criminal evidence: controlled substances, explosives, fire debris, GSR, food adulterants and chemical warfare agents, from presumptive screen to ISO 17025-certified court report.
- 99hours
- 32topics
- 10modules
Module 19 hrs3 topics
Foundations of forensic chemistry
What forensic chemistry actually does inside a casework workflow, where it sits relative to forensic physics, biology and toxicology, the sampling and chain-of-custody discipline for chemical evidence, and the certified reference materials and quantification baseline (LOD, LOQ, measurement uncertainty) that decide whether an analytical result is admissible.
Start module- Introduction and Scope of Forensic ChemistryWhat forensic chemistry actually does inside a criminal investigation, how it sits alongside forensic physics, biology and toxicology, and the working chemist's day-to-day caseload at CFSL, the US DEA labs, the UK Forensic Capability Network and the EU ENFSI drugs working group.12 min
- Sample Collection, Packaging and Chain of Custody for Chemical EvidenceFrom scene to bench: the packaging discipline for solid drug exhibits, liquid samples, post-blast debris and trace residues, the tamper-evident sealing and labelling rules that survive cross-examination, and the chain-of-custody architecture mandated under BSA 2023 (India), the US Federal Rules of Evidence and the UK Forensic Science Regulator's Codes.13 min
- Reference Standards, Certified Reference Materials and the Quantification BaselineWhy every forensic chemistry result rides on a certified reference material: USP, NIST SRM, NMIJ, BAM and Cerilliant standards; LOD, LOQ, linearity, recovery and measurement uncertainty as the four numbers that decide admissibility; calibration discipline; and the ISO 17034 traceability chain that links a peak area in your case report to a national metrology institute.14 min
Module 210 hrs3 topics
Drugs of abuse I: schedules, opioids and stimulants
The controlled-substance legal frame across India (NDPS 1985), the US (CSA), the UK (MDA 1971) and the EU (Council Decision 2005/387/JHA), the chemistry and cutting-agent profile of heroin and fentanyl analogues that drove the US overdose crisis, and the stimulant chemistry (cocaine, amphetamines, methamphetamine, MDMA) that anchors daily seizure casework worldwide.
Start module- Controlled Substances and Their Schedules: NDPS, CSA, MDA 1971 and the EU FrameThe four legal regimes a forensic chemist navigates in routine drug casework: India's NDPS Act 1985 (small and commercial quantity bands), the US Controlled Substances Act and DEA scheduling, the UK Misuse of Drugs Act 1971 (Classes A, B, C), and the EU Council Decision 2005/387/JHA early-warning and risk-assessment system run by the EMCDDA.13 min
- Opioids: Heroin, Fentanyl Analogues and Prescription DiversionsThe opioid casework stack: heroin chemistry, cutting agents and the morphine-codeine-papaverine signature; the fentanyl-analogue chemistry that drove the US synthetic-opioid overdose crisis; prescription opioids (tramadol, oxycodone, buprenorphine) and the diversion chemistry that turns regulated pharmaceuticals into seizure exhibits.14 min
- Stimulants: Cocaine, Amphetamines, Methamphetamine and MDMACocaine alkaloid chemistry, crack vs powder, cutting-agent profiles and isotope-ratio source attribution; the amphetamine family (amphetamine, methamphetamine, MDMA, MDA), enantiomer chemistry that distinguishes pharmaceutical from clandestine origin; and the clandestine synthesis routes (Leuckart, Birch / Nazi method, P2P, pseudoephedrine reduction) that drive precursor scheduling worldwide.14 min
Module 312 hrs4 topics
Drugs of abuse II: cannabis, hallucinogens, depressants and NPS
Cannabis cannabinoids (THC, CBD, HHC) and synthetic cannabinoid waves (K2/Spice), classical hallucinogens (LSD, psilocybin, DMT), depressant classes (benzodiazepines, barbiturates, GHB), and the novel psychoactive substance treadmill of cathinones, designer benzodiazepines and synthetic opioids that has reshaped forensic chemistry casework since 2010.
Start module- Cannabis: THC, CBD, HHC and the Synthetic Cannabinoid WavesCannabinoid chemistry and the Δ9-THC / CBD / CBN profile that anchors cannabis identification; the legal distinction between hemp and marijuana (0.3 per cent USDA threshold, EU 0.3 per cent, NDPS plant-vs-product framing); HHC and other Δ-isomer designer products; and the synthetic cannabinoid waves (K2, Spice, JWH series, AMB-FUBINACA) that have reshaped clandestine chemistry since 2008.14 min
- Hallucinogens: LSD, Psilocybin, DMT and the Indolealkylamine FamilyThe chemistry of the classical hallucinogens: LSD blotter analysis and the lysergamide family, psilocybin and psilocin in psychoactive mushrooms, DMT and 5-MeO-DMT in ayahuasca and toad-venom preparations; chromatographic detection at picogram levels; and the regulatory pendulum (psychedelic-assisted therapy trials, Oregon and Australia rescheduling, US FDA breakthrough designations) reshaping the legal frame.12 min
- Depressants: Benzodiazepines, Barbiturates and GHBThe depressant casework stack: benzodiazepine pharmacology and the analytical challenge of low-dose tablets (diazepam, alprazolam, clonazepam, flunitrazepam) plus designer benzos (etizolam, flubromazolam) outside scheduling; barbiturates and the historical drug-facilitated crime profile; and GHB / GBL / 1,4-butanediol with their short detection window and DFSA implications.12 min
- Novel Psychoactive Substances and the Cathinone WaveThe NPS treadmill problem: how clandestine chemists modify a controlled scaffold by a single functional group to fall outside scheduling, the cathinone wave (mephedrone, MDPV, alpha-PVP, the bath-salts era), designer benzodiazepines, and the analog-act, generic-scheduling and statutory-instrument responses across the US, UK, EU and India.13 min
Module 47 hrs2 topics
Presumptive tests and the analytical workflow
Colour-test chemistry (Marquis, Mecke, Duquenois-Levine, cobalt thiocyanate, Scott test) and the SWGDRUG identification tiers that escalate from a presumptive screen through TLC, UV, GC-MS and LC-MS/MS to a court-defensible identification, with NDPS-style small-and-commercial quantity reporting baked in.
Start module- Presumptive Colour Tests: Marquis, Mecke, Duquenois-Levine, Cobalt Thiocyanate and ScottThe screening chemistry every drug analyst runs before any instrument: Marquis (opioids and amphetamines), Mecke (opioids), Duquenois-Levine (cannabinoids), Mandelin (amphetamines), cobalt thiocyanate (Scott test for cocaine), and the false-positive profiles, NIK kit limitations and roadside-screening implications that decide whether a presumptive result can be quoted in court.13 min
- SWGDRUG Identification Tiers and the UV / TLC / GC-MS / LC-MS/MS WorkflowThe SWGDRUG Category A, B, C identification framework, the principle that no single technique is sufficient (a confirmatory ID requires at least one Category A method plus an orthogonal test), and the routine escalation across UV-Vis, TLC, GC-MS and LC-MS/MS with the chromatographic discipline, internal standards and quantification protocol that satisfies SWGDRUG, ENFSI DWG and NDPS-bench standards.13 min
Module 59 hrs3 topics
Alcohol, illicit liquor and beverage chemistry
Ethanol analysis by GC-headspace and the blood-alcohol baseline that every drunk-driving prosecution rides on, the methanol chemistry behind hooch tragedies (2022 Bihar, 2009 Gujarat, US Prohibition-era adulteration), and the statutory frame around denatured spirit, country liquor and excise-controlled beverages.
Start module- Ethanol Analysis by GC-Headspace and the Blood-Alcohol BaselineThe headspace GC-FID method that is the global reference for blood and breath ethanol quantification, the dual-column orthogonal confirmation that defends a BAC against challenge, the BAC limit landscape across India (BNS Section 185 motor-vehicle law), the US (0.08 per cent state baseline, Utah 0.05 per cent), the UK (80 mg/100 mL England and Wales, 50 mg/100 mL Scotland) and the EU, and the Widmark equation for back-calculation in fatal road-traffic and drunk-driving casework.13 min
- Methanol, Hooch Tragedies and Illicit Liquor ChemistryThe methanol oxidation pathway (formaldehyde, formic acid) that explains the blindness and metabolic acidosis of hooch deaths, the 2022 Bihar (38 deaths), 2009 Gujarat (136 deaths) and 2015 Mumbai (102 deaths) tragedies, US Prohibition-era denatured-alcohol poisonings, the analytical workflow that distinguishes methanol from ethanol on the same headspace GC run, and the post-mortem distribution that links a still site to a death cluster.13 min
- Denatured Spirit, Country Liquor and the Statutory FrameWhat denatured spirit actually contains (methanol, pyridine, methyl isobutyl ketone, Bitrex), the country-liquor stack across Indian states (T-permits, tharra, mahua, palm toddy), the excise chemistry that distinguishes legal from illicit production, and the statutory frame across the Indian Excise Acts (state-list), the US TTB regulations, the UK HMRC Excise notices and the EU Directive 92/83/EEC harmonisation.12 min
Module 69 hrs3 topics
Food adulteration, cosmetics and consumer-product chemistry
Milk and dairy adulteration (melamine, urea, detergent), the chemistry behind edible-oil and spice adulteration (Sudan dyes in chilli, lead chromate in turmeric, argemone oil in mustard), and the cosmetics chemistry (heavy metals, banned colourants, formaldehyde release) regulated under PFA / FSSAI / US FDA / EU REACH frameworks.
Start module- Milk and Dairy Adulteration: Melamine, Urea, Detergent and the 2008 China ScandalThe 2008 China melamine scandal (300,000 infants affected, 6 deaths) that rewrote dairy regulation worldwide, the chemistry that lets melamine spike apparent protein on Kjeldahl, the routine adulterants in Indian milk (urea, detergent, hydrogen peroxide, neutralisers, starch), the analytical workflow (Kjeldahl, LC-MS/MS, FTIR-ATR, milk-fat profiling), and the FSSAI / US FDA / EU EFSA enforcement regimes.13 min
- Edible Oils and Spices: Argemone Oil, Sudan Dyes and Lead Chromate in TurmericThe 1998 Delhi argemone-oil dropsy epidemic (60 deaths) and the sanguinarine HPLC marker; Sudan I-IV dyes adulterating chilli and paprika (EU RASFF notifications since 2003); the lead-chromate turmeric scandal in Bangladesh and rural India documented by Stanford's Forsyth lead-poisoning research; and the GC-MS, LC-DAD, ICP-MS and XRF workflow that detects each at part-per-billion levels.14 min
- Cosmetics Chemistry: Heavy Metals, Banned Colourants and Formaldehyde ReleaseLead and antimony in kohl and surma (the South Asian and Middle Eastern pediatric lead-poisoning route), mercury in skin-lightening creams (FDA imports alert IA-66-01), banned azo colourants (Sudan, Para Red, Rhodamine B) in lipstick, formaldehyde release from quaternium-15 and DMDM hydantoin in shampoos, and the US FDA / EU Regulation 1223/2009 / India Drugs and Cosmetics Act 1940 enforcement frame.13 min
Module 713 hrs4 topics
Explosives and post-blast residue
Low and high explosives, primary and secondary classification, the chemistry of conventional military and commercial high explosives (TNT, RDX, PETN, HMX, Composition B, C-4, Semtex), the improvised explosives that dominate modern IED casework (TATP, ANFO, urea nitrate), and the post-blast residue sampling and IMS, GC-ECD, LC-MS/MS, ion chromatography workflow that links a fragment to a charge.
Start module- Explosives Classification: Low vs High, Primary vs SecondaryHow a forensic chemist classifies an explosive from a fragment: low explosives (black powder, smokeless propellants) vs high explosives (TNT, RDX, PETN, HMX), primary initiators (mercury fulminate, lead azide, DDNP) vs secondary main charges, the deflagration vs detonation distinction, detonation velocity and brisance, and how each property maps to a class of incident and a class of analytical method.13 min
- Conventional High Explosives: TNT, RDX, PETN, HMX, Composition B, C-4 and SemtexThe military and commercial high-explosive stack a forensic chemist meets in post-blast casework: TNT (the World War history, 1993 Bombay blasts), RDX and HMX (Composition B, C-4, the Semtex H plastic explosive in Lockerbie 1988), PETN (Detasheet, shoe-bomb cases, suicide-vest detonators), the manufacturing chemistry, the IR / Raman / GC-MS / LC-MS/MS spectral signatures, and the taggant chemistry (DMDNB) mandated by the 1991 ICAO convention.14 min
- Improvised Explosives: TATP, ANFO, Urea Nitrate and Modern IEDsThe improvised-explosive chemistry behind the modern IED threat: TATP (triacetone triperoxide) in the 2005 London 7/7 attacks, the 2015 Paris and 2016 Brussels bombings, and the 2017 Manchester Arena attack; ANFO (ammonium nitrate fuel oil) and the Oklahoma City 1995 and Beirut port 2020 detonations; urea nitrate in the 1993 WTC bombing; the precursor-scheduling response (EU Regulation 2019/1148, US Ammonium Nitrate Security Program); and the peroxide-explosive detection workflow.14 min
- Post-Blast Residue Sampling and the IMS, GC-ECD, LC-MS/MS WorkflowWhat happens at a blast scene after the cordon goes up: zonal sampling around the seat of explosion, swabbing fragments and human remains, the field IMS screening (Smiths IONSCAN, Bruker E2M) that gives a presumptive result in seconds, the laboratory chromatographic confirmation (GC-ECD for nitroaromatics, LC-MS/MS for peroxides, ion chromatography for inorganic oxidisers and chloride/sulphate/nitrate anions), and the chain of evidence from fragment to charge.14 min
Module 89 hrs3 topics
Fire debris, arson and petroleum products
Fire chemistry, pyrolysis and the arson investigation framework, the passive-headspace concentration on activated carbon strips (ASTM E1387 / E1618) and GC-MS pattern recognition that identifies petroleum-distillate accelerants (petrol, kerosene, diesel), and the chemistry of petroleum products, lubricants and transformer oil that turn up in industrial casework.
Start module- Fire Chemistry, Pyrolysis and the Arson Investigation FrameworkThe fire tetrahedron, the chemistry of combustion and incomplete oxidation, pyrolysis products from common substrates (polyethylene, polyurethane foam, wood, carpet), flashover and backdraft as physical phenomena that constrain origin determination, NFPA 921 as the global investigation standard, and how the chemist's accelerant analysis fits inside the broader fire-investigation framework.13 min
- Accelerant Detection: ASTM E1387 / E1618 and Passive Headspace ConcentrationThe fire-debris analytical workflow: ASTM E1412 passive headspace concentration on activated charcoal strips, ASTM E1618 GC-MS pattern recognition (light petroleum distillate vs gasoline vs medium petroleum distillate vs kerosene vs diesel), the ignitable-liquid reference collection (ILRC) database, target compound chromatograms, the chromatographic signatures that survive a fire, and how a chemist defends an accelerant call against substrate-pyrolysis defence arguments.14 min
- Petroleum Products, Lubricants and Transformer OilBeyond accelerants: the petroleum hydrocarbon casework stack that turns up in industrial accidents and environmental forensics; the lubricant fingerprint (motor oils, gear oils, greases) and the additive package that distinguishes brands; transformer oil PCB content as a regulatory and contamination marker; biomarker chemistry (hopanes, steranes) for oil-spill source attribution; and the GC-MS, GC×GC-TOFMS and stable-isotope ratio MS workflow.13 min
Module 99 hrs3 topics
Gunshot residue chemistry
Three-component gunshot residue (lead, antimony, barium) and SEM-EDX particle morphology, the lead-free / green primer chemistry shift that has reshaped GSR detection since the 2000s, and the chemistry of firing-distance determination by Griess test and sodium rhodizonate that complements the ballistics range-determination work.
Start module- Gunshot Residue: Three-Component Particles and SEM-EDXThe chemistry of conventional primer GSR: lead styphnate, antimony sulphide and barium nitrate as the three-component fingerprint, the ASTM E1588 SEM-EDX standard for characteristic Pb-Sb-Ba particles, the morphology criterion that distinguishes spherical primer particles from environmental Pb-Sb-Ba sources, sampling protocols (adhesive lifts from hands, vehicle interiors, clothing), and the chain from a 5 μm particle to a firing-of-a-weapon conclusion.13 min
- Lead-Free Primer Chemistry and Modern GSR DetectionThe shift to lead-free / heavy-metal-free primers (Sintox, NTA, diazole-based formulations) driven by indoor-range health legislation and military procurement, the new particle signatures (Sr, Ti, Zn, Ga) that replaced Pb-Sb-Ba, the ASTM revisions and ENFSI working-group guidance reframing what a positive GSR result now means, and the ICP-MS bulk-quantification workflow that complements SEM-EDX particle analysis on critical cases.12 min
- Firing Distance Chemistry: Griess Test and Sodium RhodizonateThe chemistry that complements ballistics range determination: the modified Griess test for nitrite-containing propellant residue around an entry wound (contact, close-range, intermediate, distant categories), sodium rhodizonate as the classical lead-specific colour test, the SEM-EDX particle distribution on test-fire targets at calibrated distances, and how the chemist's range envelope is presented alongside the ballistics distance estimate in court.13 min
Module 1012 hrs4 topics
Inks, counterfeit currency, CWA and regulatory chemistry
Ink chemistry (gel, ballpoint, toner, inkjet) by TLC, HPLC, Raman and video spectral comparator workflows, the chemistry of counterfeit currency security features, the chemical warfare agent classes (sarin, VX, mustard, novichok) and OPCW designated laboratory network, and the ISO 17025 / NABL / SWGDRUG / ASTM / ENFSI accreditation regime that decides what a forensic chemistry lab can certify in court.
Start module- Ink Chemistry: TLC, HPLC, Raman and the Video Spectral Comparator WorkflowThe ink-chemistry stack that the forensic chemist owns inside a document examination: ballpoint vs gel vs roller vs liquid ink classes, dye and pigment profiles by TLC and HPLC-DAD, Raman and FTIR-ATR fingerprinting of toner and inkjet inks, the video spectral comparator (VSC) workflow for differentiating inks under UV and IR, the US Secret Service International Ink Library, and the ASTM E2285 / E2286 guidance for ink comparison.13 min
- Counterfeit Currency: Security Features and Chemical AnalysisThe chemistry of currency security features that a forensic chemist examines on a suspect note: optically variable inks (OVI) on the Indian ₹500 / ₹2000, US USD, EUR, GBP and CHF notes, fluorescent and infrared inks, intaglio printing residues, security thread metallisation, paper-fibre composition (cotton-linen vs polymer substrate), the Raman and FTIR-ATR workflow for ink and substrate, and the cross-border counterfeiting networks (FICN under NIA jurisdiction in India, USSS in the US).13 min
- Chemical Warfare Agents and the OPCW Designated Laboratory NetworkThe chemical classes covered under the Chemical Weapons Convention (CWC) and listed on Schedules 1-3: nerve agents (sarin, soman, VX, the novichok / A-series exposed by the 2018 Salisbury and 2020 Navalny incidents), vesicants (sulphur and nitrogen mustards, lewisite), blood agents (cyanides) and choking agents (phosgene, chlorine); the GC-MS / LC-MS/MS / NMR analytical workflow under OPCW Designated Laboratory accreditation; and the chemistry of the 2017 Khan Shaykhun, 2018 Douma and 2013 Ghouta investigations.14 min
- ISO 17025, NABL, ENFSI and Quality Systems for Forensic Chemistry LaboratoriesThe quality regime that decides what a forensic chemistry laboratory can certify in court: ISO/IEC 17025:2017 as the global accreditation standard, NABL (India) and A2LA (US) and UKAS (UK) as national accreditation bodies, SWGDRUG and ENFSI Drugs Working Group methodological consensus, method validation parameters (specificity, linearity, accuracy, precision, robustness), the proficiency-testing schemes (CTS, CFSAN, FAPAS) and the corrective-action discipline that keeps a chemistry lab credible.13 min