Detailed Study Notes on Forensic Toxicology and Historical Cases of Poisoning
Forensic Toxicology Overview
Introduction
Federal State Budgetary Educational Institution of Higher Education «Bashkir State Medical University»
Presented by Khalikov Airat Anvarovich, Ph.D., Professor, Head of Department of Forensic Medicine of BSMU, Ufa, 2021.
Reference artwork: Jan Matejko’s "Poisoning of Queen Bona" (1859).
Historical Context of Poisons
Poisons have been historically utilized for murder, with notable examples including:
Arsenic: Known as the „king of poisons“. Influential figures like Napoleon Bonaparte, King George III, and Simon Bolivar are recorded to have died with arsenic involvement.
Middle Ages use: Arsenic and belladonna were utilized for cosmetic purposes to enhance skin color, making women’s skin appear whiter.
Napoleon's Hair Study (2000)
On September 15, 2000, Ben Weider presented five strands of Napoleon’s hair to an institute in Strasbourg for toxicological analysis.
The hair strands underwent analysis using spectrophotometric methods.
Emphasis on primary cleaning procedures to remove external contaminants.
Results indicated significant arsenic presence, raising questions about Napoleon's death and potential poisoning.
Analysis Results
Origin, mass, and arsenic concentration of analyzed hair strands:
"Lady Goland": Mass - 1.2 mg, Length - 4-6 cm, Arsenic Concentration - 38.53 ng/mg.
"Abbot Vignali": Mass - 2.0 mg, Length - 5-6 cm, Arsenic Concentration - 15.50 ng/mg.
"Abraham Noverraz": Mass - 2.2 mg, Length - 6-9 cm, Arsenic Concentration - 6.99 ng/mg.
"Louis Marchand": Mass - 0.5 mg, Length - 4-6 cm, Arsenic Concentration - 15.20 ng/mg.
Concentration levels reported 7-38 times above permissible limits.
Nano-SIMS Method Utilization
Research at the University of Luxembourg using Nano-SIMS method retained hair strands for further analysis.
Explanation of the method: Hair samples are segmented and bombarded with cesium ions, which emit secondary radiation correlating to arsenic wavelength, providing image analysis of hair slices.
Highlighted that chronic arsenic exposure is indicated by the presence of arsenic in the hair’s core as well as its surface.
This analysis conclusively debunked contamination theories related to preservation agents.
Toxicological Definitions
Chemical Injury
Defined as a structural and functional disorder from chemical or physical-chemical effects of exogenous substances.
Includes poisoning and chemical burns.
Poisoning or Intoxication
Described as a functional disorder from poisonous substances leading to illness or death.
Factors Determining Toxic Effects
Factors determining the poisonous effect:
State of matter (solid, liquid, gas).
Dose and concentration within the bodily fluids.
Ability to cause cumulative effects.
Excretion pathways and physiological variations among individuals.
Faster absorption via gaseous poisons through the lungs versus liquids and solids.
Concept illustrated with historical reference to the use of chlorine gas during WWI (Second Battle of Ypres).
Dose-Response Model
Doses categorize from indifferent to toxic or fatal depending on quantity consumed. Paracelsus famously stated, "Dose makes the poison".
Accumulation of Poisons
Some substances accumulate within the body, causing delayed poisoning effects.
Example: Steve Ladwin’s body containing antibodies to over 35 different poisons due to habitual exposure over 25 years.
Classification of Poisonous Substances
Corrosive Poisons: e.g. acids and alkalis causing necrosis.
Destructive Poisons: e.g. ethylene glycol leading to tissue damage.
Blood Poisons: e.g. cyanides and carbon monoxide affecting blood functions.
Functional Poisons: e.g. ethanol and narcotics causing systemic effects.
Food Poisoning: Certain poisons are associated with foodborne illness.
Forensic Diagnosis of Poisoning
A comprehensive process involving:
Crime scene investigation and bodily examinations.
Identification of chemical evidence at the crime scene.
External Examination Techniques
Identifying chemical burns or odors linked to poison entry routes:
Oral, rectal, nasal entry indicators from external burns or physical signs.
Poison Excretion Pathways
Primarily through kidneys and lungs; less through gastrointestinal tract.
Role of liver in metabolizing and detoxifying various substances.
Laboratory Analysis Techniques
Use of gas chromatography and spectrometry to identify toxins and poisons.
Importance of collecting samples from suspected poisoning cases for detailed analysis.
Specific Poisoning Cases
Corrosive Poisons: Commonly involve acid and alkali poisons causing tissue necrosis.
Acid poisoning: Indicative symptoms of burns and systemic acidosis.
Organophosphate Poisoning: Results in cholinergic syndromes, presenting various physical signs.
Alcohol Poisoning: Ethanol as a prevalent cause of acute poisoning, affecting respiratory centers leading to potential fatal outcomes.
Clinical Manifestations and Death Causes
Immediate death causes include asphyxia, cardiac arrest, or organ failure due to toxic substances.
Autopsy findings can reveal specific reactions based on substances ingested, highlighting progression from acute effects (e.g., burns) to chronic (e.g., organ failure).
Biochemical Considerations in Forensic Toxicology
Biochemical analysis plays a crucial role in postmortem evaluations, quantifying metabolites and identifying toxicological mechanisms post-exposure.
Studies can highlight disturbances in metabolism that provide insights into the substances involved and their impacts on the body during life.
Conclusion
Forensic toxicology continues to unravel the complexities of substance effects on human health, aiding in criminal investigations and public health understanding. The integration of various analysis methods enhances accuracy in identifying causes of death and understanding toxicological impacts.
Notable References
The role of Paracelsus in toxicology.
Clinical symptoms associated with various poisons.
Importance of early and continuous biochemical analysis in forensic investigations.