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Forensic Science Chapter 1 Introduction to Forensic ScienceHistory and Development of Forensic ScienceForensic science is the application of science to criminal and civil laws that are enforce by policeagencies in a criminal justice system. Forensic science began with those individuals who developed the principles andtechniques necessary to identify or compare physical evidence, and with those whorecognized the necessity of merging of those principles into a coherent discipline thatpractically applied to the criminal justice system. Many believe that Sir Arthur Conan Doyle, through his fictional character, SherlockHolmes, popularized scientific crime detection methods. It was Holmes who first appliedthe principles of serology the study of blood, fingerprinting, firearm identification, anddocument examination long before their value was first discovered and implemented byreal life criminal investigators.The following are some pioneers who made early contributions to formulating the disciplinesthat now constitute forensic science:Mathieu Orfila “Father of Modern Toxicology” Mathieu Joseph Bonaventure Orfila (April 24, 1787 - March 12, 1853) was a Frenchtoxicologist and chemist.Publications: Trait des poisons or Toxicologie generate (1813)* Elements de chimie medicate (1817) Leons de médecine legate (1823) Trait des exhumations juridiques (1830) Recherches sur lempoisonnement par lacide arsenieux (1841) His fame rests mainly on the first named work, published when he was only in histwenty seventh year. It is a vast mine of experimental observation on the symptoms ofpoisoning of all kinds, on the appearances which poisons leave in the dead body, ontheir physiological action, and on the means of detecting them.Alphonse Bertillon “Father of Criminal Identification” Alphonse Bertillon was a French policeman who believed that people could bephysically identified to a certainty by conducting a series of measurements. His theorywas that by using 11 different measurements from a person's body, he could accurately1Forensic Science Chapter 1 Notes
establish their identity at a later date. This system of identification is known asAnthropometry. Today, we use photographs and fingerprints as the standard foroffender identification (booking).Anthropometry – The areas of measurement were chosen randomly. After discardingsome measurements, Bertillon decided to use the breadth of the outstretched arms,head length and width, left foot length, left little finger length, trunk height, bodyheight, width and length of the right ear and the length of the left forearm.Bertillon also included fingerprints as part his new system which he called"anthropometrics". Bertillon's system became popular with law enforcement during the1880s. Offenders were measured, photographed and fingerprinted during their bookingprocess.However, in 1903 something happened that caused law enforcement to discardBertillon's system of identification.What happened to Bertillon in 1903? In 1903, a prisoner by the name Will West was sentenced to incarceration at the UnitedStates Penitentiary at Leavenworth, Kansas. During his in-processing, the records clerk obtained Will West's Bertillon measurementsand photograph from records at the prison Will West denied ever being incarcerated at the facility. Subsequent investigation disclosed that a William West had previously beenincarcerated in the facility until September 9, 1901. By examining the photographs, one can see the failure of the Bertillon system. Compare the Bertillon measurements in particular; keeping in mind the various factorsthat would affect the measurements. This failure strengthened the science offingerprints as the normally accepted method of personal identification. The authorities compared their fingerprints and determined that Will West was not thepreviously recorded William West. Recent opinions suggest that Will and William West were related, therefore thecloseness in measurements and appearance. As a result of this incident, Bertillon's"anthropometric" identification system was quickly discarded in favor of fingerprints.Frances Galton Frances Galton undertook the first definitive study of fingerprints as a method ofidentification. Developed a methodology of classifying them in 1892. His work described the basic principles that formed the present system of identificationby fingerprints. Developed a method of classification for fingerprints. Publication: “Finger Prints” – a statistical proof of uniqueness of finger prints Wrote the basic principles of the present system of identification by finger printanalysis. Cousin to Charles Darwin2Forensic Science Chapter 1 Notes
Leone Lattes Furthered the work of Dr Karl Landersteiner Leone Lattes discovered that blood can be grouped into different categories. Since 1915,blood types have been recognized as A, B, AB, and O. Developed a test to type dried blood that is used for criminal investigations. Today, his procedure is utilized often by forensic scientists.Calvin Goddard Ballistics – chemical analysis to tell whether a gun has been fired or not. Use of a microscope to determine if a tool marks on a fired bullet matches a specificgun. Established the comparison microscope as an indispensible tool of the fire armsexaminer.Albert S. Osborn Fundamental Principles of Document Examination. Book: Questioned Documents (still used today) Handwriting analysis Document examination Paper examinationWalter C. McCrone Microscope techniques Established the McCrone Research Institute – Chicago IL. World renown for microscopeand microscope trace evidence detection. Did analysis on the “Shroud of Turin”.Hans Gross Wrote the first treatise on – Application of Science Disciplines to the Field of CriminalInvestigation. Book – Criminal Investigation: use of microscope, chemistry, mineralogy, zoology,botany, and anthropometry. Forensic Journal – to report new and improved methods of scientific crime detection.Dr. Edmond Locard Established the first workable crime lab. Founder and Director of the Institute of Criminalistics at the University of Lyons.International Center for the study and research in forensic science. Wrote: Locards Exchange Principle Locards Exchange Principle3Forensic Science Chapter 1 Notes
o States and believes that every criminal can be connected to a crime scene bydust particles carried to the crime scene, transfer occurs whenever a criminalcomes into contact with objects or a person.The Forensic Laboratory J. Edgar Hoover and the FBI in 1932 organized a national laboratory to offer forensicservices to all law enforcement agencies in the country. This lab is now the world’s largest forensic lab, performing over a million examinationsper year Quantico - FBI Forensic Science Research and Training Center (c1981)o Used as a model for forensics labs formed at the state and local levels in the USand other countries. LAPDo The oldest crime lab in the US.o Created by August Vollmer in 1923.o In 1930’s Vollmer headed the first US University Institute for Criminology andCriminalistics at UC Berkley.o California was also the first state to network all the labs and share information. United Kingdom Labo In the United Kingdom, forensic laboratories charge for their services as a meansof funding.o It is thought that there is an increase in accountability and efficiency.Organization of a Crime Lab1. Federal Level: FBI Federal Bureau of Investigation DEA Drug Enforcement Agency ATF Alcohol Tobacco and Firearms USPS United States Postal Service2. State Agencies – each state has at least one forensic lab. Some states have astatewide network, while others use a regional system.3. Private Forensics Labs - there are about 320 private laboratories.4. Municipal – these are usually independent of the state labs. Example NYC has aforensic lab, specifically for the five boroughs of NYC.5. Other Countries - Approximately 100 nations have at least one forensiclaboratory. Canada – Has three laboratories as well as six Royal Mounted Policelaboratories. Two training facilities:o Center for Forensic Sciences – Torontoo Inst. of Legal Medicine and Forensic Sciences – Montreal4Forensic Science Chapter 1 Notes
Services of the Crime LabThere are a wide variety of services available, the services offered varies from lab to lab.This is due to:a. Variations on the lawsb. Different capabilities and functions of the organization heading up the lab. (ex:DEA vs. FBI)c. Budgeting and staffing limitations.“Full Service” Laboratory Services1. Physical Science Unit – applies physics, chemistry, geology to the identification andcomparison of crime scene evidence. (drugs, glass, paint, explosives and soil)2. Biology Unit – biologists and biochemists apply their knowledge to analysis of DNA,dried blood and other body fluids, comparison of hair and fibers.3. Firearms Unit (Ballistics) – examination of: discharged bullets, casings, shot gun shellsand ammunition; Garments and other items for gun powder residue; distance betweenthe firearm and the target; comparison of tool marks on bullets and guns.4. Document Examinations Unit – comparison and examination of: handwriting,typewriting, ink, toner, paper, charred documents and/or erasures/obliterations.5. Photography Unit – responsible for:a. Examination and photographic record of the crime scene.b. Digital imaging and enhancement via UV and x-ray photography.c. Preparation of photographic exhibits for court.Optional Service1. Toxicology – presence of drugs or poisons in the body fluids or tissues.2. Latent Finger Prints Unit – responsible for processing and examining evidence forfingerprints.3. Polygraph Unit – (lie detector test) can be offered at either the forensic lab or the policestation.4. Voice Print Analysis – examination of recorded evidence.a. This procedure may be able to identify the voice to a particular suspect.b. Spectrograph – transforms speech into a visible graphic display (voice print)5. Evidence Collection Unit – specially trained personnel whose primary function is torecognize, collect and preserve physical evidence at the crime scene.Functions of the Forensic ScientistAnalysis of Physical Evidence: any procedure used to analyze physical evidence must satisfy thecriteria of admissibility that has been established by the courts.Precedent Cases:1. Frye standard – the court decides if a procedure is:a. generally acceptedb. Accepted and considered relevant by the scientific community.2. Federal Rules of Evidence (rule 702)5Forensic Science Chapter 1 Notes
a.b.c.d.Testimony is based on facts or data.Is a product of reliable principles and methods.Applies the principles and methods to the facts of the case.Rule 702 is applicable to state courts if:i. The scientific technique or theory can be and has been tested.ii. If the technique/theory has been subject to peer review and publication.iii. The techniques potential rate of error is low.iv. Existence and maintenance of standards controlling the techniquesoperation.v. Whether the scientific theory/method has attracted widespreadacceptance within the relevant scientific community.Provision of Expert Testimony Forensic scientist – may be called upon to testify regarding the methods and conclusionsat a trial hearing. To be considered an expert witness:o The witness must provide his or her background: training, educational degrees,relevant experience, professional societies, and publication of articles andpapers.o This all determines the competency of the witness.o The expert’s credentials are on trial to allow the witness to give theirprofessional opinion. Any testimony given is opinion, based on a reasonable certainty based ontraining and experience. Expert witness is expected to defend the tests in question.Evidence Collection Unit Personnel are specially trained to recognize, collect and preserve physical evidence. These technicians retrieve evidence from the crime scene.Forensic Pathologist (Medical Examiner or Coroner) This person is a medical doctor.o Responsibilities: Autopsy – method of dissection to determine the cause of death. 5 categories of death: Natural, Accidental, Suicide, Homicide andUndetermined.Determination of the time of death: The stages of decomposition are used to determine the approximate time of death.1. Rigor mortis- immediately upon death the muscles relax, soon after they stiffencausing the body to become rigid. (Lasts from 24-36 hours).2. Livor Mortis – occurs when the blood settles to the lowest point, based on bodyposition. This causes the tissues in that area to appear blue/black to purple.6Forensic Science Chapter 1 Notes
a. Areas that were during constricted during the livor mortis period appear paleor bloodless.3. Algor mortis - is the cooling of the body after death.a. Time of death can be calculated using the ambient room temperature andthe rate of heat loss from the body.b. Factors include: "size" of the body, clothing and coverings, movement andhumidity of the air, and immersion in water. “Under average conditions theclothed body will cool in air at the rate of about 1.5 C an hour for the first 6hours and average a loss of some 1 C for the first 12 hours."c. This method is used to approximate time of death.Forensic Anthropologist Forensic anthropology is the application of physical or biological anthropology in a legalcontext. The majority of cases encountered by a forensic anthropologist involve the humanskeleton. The routine activities of the forensic anthropologist extend to the examination of badlydecomposed or severely damaged human bodies. Forensic anthropologists are also called on in the search and recovery of humanremains.o Through forensic anthropology the following may be identified using the skeletalremains: Origin, sex of the victim, approximate age, race, height and possibleskeletal injuries or identifiers.Forensic Entomology Is the use of the insects, and their
Albert S. Osborn Fundamental Principles of Document Examination. Book: Questioned Documents (still used today) Handwriting analysis Document examination Paper examination Walter C. McCrone Microscope techniques Established the McCrone Research Institute – Chicago IL. World renown for microscope and microscope trace evidence detection. Did analysis on the “Shroud of Turin”. Hans
