forensic science: fundamentals & investigations, chapter 9 1 chapter 9 drug identification and...
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Forensic Science: Fundamentals & Investigations, Chapter 9 1
Chapter 9 Drug Identification and Toxicology By the end of this chapter you will be able to:
o Identify the five types of controlled substances o Relate signs and symptoms of overdose with a
specific class of drugs or toxins o Describe the role of various types of toxins in
causing death o Discuss agents that may be used in bioterrorism o Define and describe the goals and practice of
toxicology All Rights Reserved South-Western / Cengage Learning © 2012, 2009
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Forensic Science: Fundamentals & Investigations, Chapter 9 2
Introduction Introduction
Forensic toxicology helps determine cause-and-effect relationships between
o Exposure to a drug or other substance
and o Toxic or lethal effects from that exposure o Toxicology is the study of poisons and the
identification of drugs.• Medicinal, Recreational or Criminal purpose
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Forensic Science: Fundamentals & Investigations, Chapter 9 3
Introduction Introduction
Toxicity – deals with degree substance is poison or can cause injury.
People can be exposed to toxic substances: o intentionally—
by treating illness or relieving pain o accidentally—
by harmful combinations or overdoses o deliberately—
by harming or killing others, or by suicide
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History
o Socrates – 399 B.C. (hemlock)o 17th Century (1600’s) – Rich and famous
• Arsenic and cyanide
o 18th Century (1700’s) – chemical analysis available• Orfila and Christison (M.D.’s)
Forensic Science: Fundamentals & Investigations, Chapter 9 4
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Forensic Science: Fundamentals & Investigations, Chapter 9 5
Poison—Murder, Accidental Overdoses, and Drug Offences
o Poisoning causes less than ½ of 1% of all homicides
o Accidental drug overdoses are more common
o Drug offenders
• More than 50% of the federal prison population
• About 20% of the population in state prisons
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Forensic Science: Fundamentals & Investigations, Chapter 9 6
Controlled Substances
Legal drugs – sale and possession are restricted (potential for abuse)
1. Hallucinogens
2. Narcotics
3. Stimulants
4. Anabolic steroids
5. Depressants
Know the charts on pages 254 and 25
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Forensic Science: Fundamentals & Investigations, Chapter 9 7
Controlled Substances—Hallucinogens
o Often derived from plantso The effect and intensity of response to these
drugs varies from person to person. o Affects the user’s perceptions, thinking, self-
awareness, and emotions
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Forensic Science: Fundamentals & Investigations, Chapter 9 8
Controlled Substances—Hallucinogens
o Affects of an overdose often include • Increased heart rate • Increased blood pressure• Panic attacks, anxiety, or psychosis
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Forensic Science: Fundamentals & Investigations, Chapter 9 9
Controlled Substances—Hallucinogens
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Forensic Science: Fundamentals & Investigations, Chapter 9 10
Controlled Substances—Narcotics
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Forensic Science: Fundamentals & Investigations, Chapter 9 11
Controlled Substances—Stimulants
o Increases feelings of energy and alertness
o Suppresses appetiteo Afterwards, depression often resultso Overdose affects include high blood
pressure, agitation, confusion, seizureso Stimulants tend to be highly addictive
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Forensic Science: Fundamentals & Investigations, Chapter 9 12
Controlled Substances—Stimulants
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Forensic Science: Fundamentals & Investigations, Chapter 9 13
Controlled Substances—Anabolic Steroids
o A chemical structure similar to testosteroneo Promote cell and tissue growth increasing bone
mass and body muscle. o Popular with weightlifters, bodybuilders, and
other athleteso What are some of the negative side effects?
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Forensic Science: Fundamentals & Investigations, Chapter 9 14
Controlled Substances—Depressants
o Affects the central nervous system by increasing GABA activity, a neurotransmitter
o Increased GABA causes drowsiness and slowed brain activity
o Relieves anxiety and produces sleepo Side effects include slurred speech and loss of
coordinationo Mixing depressants with alcohol and other drugs
increases potency and health risks
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Forensic Science: Fundamentals & Investigations, Chapter 9 15
Controlled Substances—Alcohols
o In what way are alcohols toxic?
• Acetaldehyde…..acetic acid……hangover symptomso How is grain alcohol produced?
• Fermentation of sugar in fruits and grainso What are the classic symptoms of a hangover?
• Dehydration, nausea, headache, weaknesso What is the effect of alcohol on the central nervous system?
• Depression o What can chronic alcohol abuse cause?
• Liver damage and dangerous behavior
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Forensic Science: Fundamentals & Investigations, Chapter 9 16
Controlled Substances—Bacterial Toxins
o Tetanus (also called Lockjaw)• Produced by the Clostridium tetani bacteria • Causes violent muscle spasms
o Botulism • Produced by Clostridium botulinum—botulism • Paralyzes muscles – painful spasms• Causes irreversible damage to nerve endings• Extremely deadly in very small amounts• Most poisonous biological substance
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Forensic Science: Fundamentals & Investigations, Chapter 9 17
Controlled Substances—Pesticides and Heavy Metals
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Forensic Science: Fundamentals & Investigations, Chapter 9 18
Controlled Substances—Pesticides and Heavy Metals
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Forensic Science: Fundamentals & Investigations, Chapter 9 19
Controlled Substances—Bioterrorism Agents
Ricin o A poisonous protein in the castor bean o Lethal in extremely small amountso Enters the body in various ways:
• inhaled as a mist or a powder • ingested as food or drink• injected into the body
o Causes death within a few hours
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Forensic Science: Fundamentals & Investigations, Chapter 9 20
Controlled Substances—Bioterrorism Agents
Anthrax o Bacillus anthracis, which forms endosporeso Spreads to humans from infected animals o Enters the human body through:
• Inhalation; causing breathing problems that usually result in death
• Ingestion; becoming fatal in 25% to 60% of cases • Absorption via the skin; leading to death in about
20% of untreated cases
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Forensic Science: Fundamentals & Investigations, Chapter 9 21
. . . . . . . . . Summary. . . . . . . . . . . . . . . . . Summary. . . . . . . .
o Forensic toxicology seeks to identify poisons or drugs in criminals and victims.
o Toxicology is important in studying cases of drug overdose and sporting violations.
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Forensic Science: Fundamentals & Investigations, Chapter 9 22
. . . . . . . . . . . . . Summary. . . . . . . . . . . . . . . . . Summary. . . .
o Controlled substances fall into five main groups:• Hallucinogens • Narcotic• Stimulants• Steroids• Depressants
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. . . . . . . . . . . . . . . . . Summary. . . . . . . . . . . . . . . . . Summary
o Poisons can be produced by living organisms.
o Pesticides and heavy metals are common poisons.
o Bioterrorism agents include ricin and anthrax.