1 forensic science chapter 1: introduction. 2 forensic science applies the knowledge and technology...
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3 Limited definition For this class, Forensic science is the application of science to those criminal and civil laws that are enforced by police. We will deal with crime-scene and evidence analysis Not medicine, psychology, etc.TRANSCRIPT
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Forensic Science
Chapter 1: Introduction
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Forensic science Applies the knowledge and technology of
science for the definition and enforcement of laws• Criminal justice
• Provide accurate and objective information
• Food safety and quality• Medications• Water purity• Pesticide use• Air pollution
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Limited definition For this class, Forensic science is the application of
science to those criminal and civil laws that are enforced by police.
We will deal with crime-scene and evidence analysis• Not medicine, psychology, etc.
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Criminalistics Another term for forensic science Specifically applied to crime solving
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History and development of forensic science Made popular by Sir Arthur Conan Doyle
• Author of Sherlock Holmes stories Often imagined scientific detection
methods before they were actually discovered• Predicted ability to identify blood stains with a
chemical that reacts only with hemoglobin
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Mathieu Orfila 1787 – 1853 Father of forensic toxicology 1814 – Studied detection of poisons and
their effects on animals
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Aphonse Bertillon 1853 – 1914 1879 – Anthropometry Used series of body measurements for
identification Replaced by fingerprinting in early 1900s Still used as part of facial recognition
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Francis Galton 1822 – 1911 1892 – fingerprint analysis and
identification
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Leone Lattes 1887 – 1954 1915 – procedure for determining blood
group (A, B, AB, or O) of dried bloodstains
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Calvin Goddard 1891 – 1955 Used comparison microscope to
examine bullets from crime scenes and from suspects’ weapons
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Albert S. Osborn 1858 – 1946 1910 – Questioned Documents –
document examination procedures• Still used as a reference
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Walter C. McCrone 1916 – 2002 Using microscopes to examine evidence
• Hairs, fibers, organic material, etc.
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Hans Gross 1847 – 1915 1893 – advocated the application of
science to criminal investigations
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Edmond Locard 1877 – 1966 1910 – started police lab in Lyons, France Believed that every criminal can be connected
to a crime by dust particles carried from the crime scene
Proved this in a series of well-publicized investigations• Led to the formation of other police laboratories
throughout Europe
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Locard’s Exchange Principle The exchange of materials between two
objects that occurs whenever two objects come into contact with one another.
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FBI Lab Established in 1932
• J. Edgar Hoover Now the world’s largest forensic science
lab Model for labs around the US and in
other countries Training Center – 1981 – training and
research into new forensic science methods
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LAPD lab Oldest in the US 1923
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Labs in the US Local and independent
• Federal• State• County• City
California has unified somewhat into a network, exchanging information and expertise
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Labs in Britain National system of regional labs Police pay a fee for services of labs More efficient? More “fair”?
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Growth in crime labs Number of labs greatly increases in past
35 years Court decisions favoring scientific
evidence• Miranda warning
Modern technology – DNA Increase in crime rate – especially drugs
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Federal labs FBI DEA (Drug Enforcement Administration) ATF (Bureau of Alcohol, Tobacco,
Firearms, and Explosives) USPS (Postal service)
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Basic lab services Physical Science Biology Firearms Document Examination Photography
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Physical Science Chemistry, Physics, Geology Chemicals Trace elements Drug identification
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Biology DNA Compare hairs and fibers Compare botanicals – wood and plants
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Firearms Unit Guns Ammunition Gunshot residue Tool marks
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Document Examination Handwriting and typewriting Paper and ink analysis Indented writings Damaged documents (burned, etc.)
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Photography Record evidence Digital imaging IR, UV, and X-ray photography Prepare courtroom exhibits
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Optional lab services Toxicology Fingerprints Polygraph Voiceprint Evidence collection
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Toxicology Find drugs or poisons in tissues and
fluids
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Fingerprints Processing and examining fingerprints
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Polygraph Lie detectors Users must be trained in interrogation Not purely scientific – results not always
reliable
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Voiceprint Compare voices on different recordings Individuals produce unique sound and
speech patterns
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Evidence collection Trained personnel to collect evidence
from the scene
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Reality check A criminalist will normally work in only
one area – the scene OR the lab If they are in the lab, they usually are in
one specific area, they don’t know about everything
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Analyzing evidence Scientists must be aware of court rulings
on procedures and techniques
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The Frye Standard Named after Frye v. United States
(1923)• When the lie detector test was rejected
The technique in question must be accepted by a meaningful segment of the scientific community
Must be “generally accepted”
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Federal rules of Evidence More flexible Daubert v. Merrell Dow Pharmaceutical, Inc.
(1993) The trial judge can act as a “gatekeeper” and
determine whether or not the science is based on a reliable foundation• Has it been tested?• Has it been reviewed and published?• What is its rate of error?• Are there standard operating procedures?• Is it widely accepted?
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KumhoTire Co., Ltd. V. Carmichael 1999 “gatekeeping” role applies to all expert
testimony• “technical”• “other specialized”
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Coppolino v. State (Florida) Cause of death was overdose of a drug that
had never before been detected in the human body
Medical examiner’s explanation satisfied judge, despite lack of other experimental data
Allowed testimony• “Society need not tolerate homicide until there
develops a body of medical literature about some particular lethal agent.”
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Expert witness An individual whom the court determines
possesses knowledge relevant to the trial that is not expected of the average person
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Expert knowledge Can be acquired through
• Experience• Training• Education• Combination of above
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Forensic science experts Usually don’t have degrees in forensic
science• Chemistry• Biology• Physics• Geology
Rely on training and years of experience
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Credibility Expert witnesses must prove their
knowledge by citing degrees and experience
They may also be asked questions to prove or disprove their expertise
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Offering opinions Ordinary witnesses must only present
facts that come from personal knowledge Expert witnesses may present opinions
on the significance of scientific findings Must present only the truth – including
possible errors in the methods
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Evidence collection Specially-trained technicians Police officers must also be trained
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Forensic Pathology Investigation of sudden, unnatural,
unexplained, or violent deaths Autopsy – the medical dissection and
examination of a body in order to determine cause of death• Natural• Homicide• Suicide• Accident• undetermined
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Rigor Mortis The medical condition that occurs after
death and results in the shortening of muscle tissue and the stiffening of body parts in the position they are in when death occurs
Appears within 24 hours, gone in 36 hours
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Livor mortis The medical condition that occurs after
death and results in the settling of blood in areas of the body closest to the ground
Begins immediately and lasts for up to 12 hours
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Algor Mortis Postmortem changes that cause a body
to lose heat About 1 to 1 ½ degrees F each hour Depends on location and size of body,
clothing, and weather conditions
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Forensic Anthropology Identification and examination of skeletal
remains Can reveal sex, age, race, and injuries Facial reconstructions
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Forensic Entomology Study of insects Used to estimate time of death Depends on temperature
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Forensic Psychiatry Evaluate behavioral disorders Determine competency Help develop suspect profiles
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Forensic Odontology Identification through dental records Bite mark analysis
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Forensic Engineering Failure analysis Accident reconstruction Causes and origins of fires and
explosions