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Slide 1 - An Introduction toForensic Science
Slide 2 - What is Forensic Science? …the application of science to those criminal and civil laws that are enforced by police agencies in a criminal justice system.
Slide 3 - Forensic Science is… Applied Science Often called “criminalistics”
Slide 4 - Forensic Science applies Chemistry Biology Physics Geology Places physical evidence into a professional discipline. to civil and criminal law }
Slide 5 - The development ofForensic Science
Slide 6 - Sir Arthur Conan Doyle Popularized physical detection methods in a crime scene Developed the character Sherlock Holmes
Slide 7 - Sir Arthur Conan Doyle 1887 published first novel, A Study in Scarlet "I've found it! I've found it," he shouted to my companion, running towards us with a test-tube in his hand. "I have found a re-agent which is precipitated by haemoglobin, and by nothing else . . . . Why, man, it is the most practical medico-legal discovery for years. Don't you see that it gives us an infallible test for blood stains? . . . . The old guaiacum test was very clumsy and uncertain. So is the microscopic examination for blood corpuscles. The latter is valueless if the stains are a few hours old. Now, this appears to act as well whether the blood is old or new. Had this test been invented, there are hundreds of men now walking the earth who would long ago have paid the penalty of their crimes. . . . Criminal cases are continually hinging upon that one point. A man is suspected of a crime months perhaps after it has been committed. His linen or clothes are examined and brownish stains discovered upon them. Are they blood stains, or mud stains, or rust stains, or fruit stains, or what are they? That is a question which has puzzled many an expert, and why? Because there was no reliable test. Now we have the Sherlock Holmes's test, and there will no longer be any difficulty." → had a considerable influence on popularizing scientific crime-detection methods
Slide 8 - Mathieu Orfila (1787 – 1853) Father of Forensic Toxicology 1814 - Treatise on detection of poisons & their effects on animals.
Slide 9 - Alphonse Bertillon (1853 – 1914) Father of Criminal Detection Devised the first scientific system of personal identification, using body measurements known as anthropometry in 1879.
Slide 10 - Francis Galton (1822 – 1911) Conducted the first definitive study of fingerprints and their classification. 1892 – Treatise entitled Finger Prints
Slide 11 - Leone Lattes (1887 – 1954) Devised a simple procedure for determining the blood type (A,B,O,AB) of a dried bloodstain
Slide 12 - Calvin Goddard (1891 – 1955) Used a comparison microscope to determine if a bullet was fired from a specific gun Published study of “tool marks” on bullets
Slide 13 - Albert S. Osborn (1858 – 1946) Developed fundamental principles of document examination 1910 – Treatise Questioned Documents Was responsible for the acceptance of documents as scientific evidence by the courts
Slide 14 - Edmond Locard (1877 – 1966) Demonstrated how the principles developed by Hans Gross could be incorporated into a workable crime lab. Locard's exchange principle states that once contact is made between two surfaces a transfer of material(s) will occur.
Slide 15 - Organization of aCrime Laboratory
Slide 16 - Crime Labs Since the 1960's the number of crime labs increased due to the courts demanding secure scientifically evaluated evidence. More crime More drug related crime Greater need for physical evidence Use of DNA profiling (1990’s) Presently there are 350 Crime Laboratories in the U.S.
Slide 17 - Services of the Crime Lab Many local crime laboratories have been created solely for the purpose of processing evidence Currently most of their energy and funds are used to analyze drugs and DNA. In 1932, Hoover first established a national forensics laboratory to support all law enforcement in the U.S. The oldest American forensics laboratory is in Los Angeles, California, created in 1923 by August Volmer.
Slide 18 - Crime Lab Units Standard Physical Science Biology Firearms Documents Photography Optional Toxicology Fingerprints Polygraph Voice Print Evidence
Slide 19 - Basic Services Provided byFull-Service Crime Laboratories Physical Science Unit: Applies the principles and techniques of Chemistry Physics Geology to the identification and comparison of crime-scene evidence Biology Unit: Identifies dried bloodstains and body fluids Compares hairs and fibers Identifes and compares botanical materials such as wood and plants Performs DNA analysis
Slide 20 - Basic Services (continued) Firearms Unit: examines Firearms Discharged bullets Cartridge cases Shotgun shells Ammunition of all types Document Examination Unit: Analyzes handwriting, paper and printers of documents Photography Unit: Examines and records physical evidence at the crime scene and at suspects' locations
Slide 21 - Optional Services Provided by Full-Service Crime Labs Toxicology Unit: Examines body fluids and organs in order to determine the presence and identification of drugs and poisons Latent Fingerprint Unit: Processes and examines evidence for latent fingerprints i.e. those found on surfaces Polygraph Unit: Uses lie detectors, an essential tool of the crime investigator rather than the forensic scientist
Slide 22 - Optional Services (continued) Voiceprint Analysis Unit: Involved in cases of telephone threats or tape-recorded messages Investigators may be able to connect a voice to a particular suspect Evidence-Collection Unit: Incorporates evidence collection into a total forensic science service
Slide 23 - The Functions of theForensic Scientist Analysis of Physical Evidence The forensic scientist must be skilled in applying the principles and techniques of the physical and natural sciences in order to identify the many types of evidence that may be recovered during crime investigations. Expert witness An expert witness possesses a particular skill or has knowledge in a trade or profession that will aid the court in determining the truth.
Slide 24 - The Functions of theForensic Scientist(continued) Specially trained evidence collection technicians Training in Proper Recognition, Collection, and Preservation of Evidence is required so that the forensic pathologist, as the medical examiner or coroner, can determine the cause of death via an autopsy.
Slide 25 - Other Forensic Services Death can be classified into five different categories: natural death, homicide, suicide, accident or undetermined manner of death. Forensic Pathology The cause of death can often be determined by performing an autopsy
Slide 26 - Other Forensic Services - 2 Forensic Pathology – continued After a human body expires there are several stages of death Rigor Mortis immediately following death, the muscles relax and then become rigid, shortening of the muscles. Livor Mortis when the human heart stops pumping, due to the blood begins to settle in the parts of the body closest to the ground due to gravity. The skin will appear dark blue or purple in these lower areas close to the ground. Algor Mortis the process in which the body temperature continually cools after death until it reaches room temperature, enabling the medical examiner to establish the general time of death.
Slide 27 - Other Forensic Services - 3 Forensic Anthropology: Primarily involves the identification and examination of skeletal remains, in order to determine if the remains are human or another type of animal. If human, ethnicity, sex, approximate age, and manner of death can often be determined by an anthropologist.
Slide 28 - Other Forensic Services - 4 Forensic Entomology The study of insects and their developmental stages Can help to determine the time of death by knowing when those stages normally appear in the insect's life cycle
Slide 29 - Other Forensic Services - 5 Forensic Psychiatry The study of human behavior and legal proceedings in both civil and criminal cases In civil and criminal cases, competency often needs to be determined In criminal trials, the evaluation of behavior disorders is often required in order to establish the psychological profile of a suspect.
Slide 30 - Other Forensic Services - 6 Forensic Odontology An odontologist can match bite marks to a suspect's teeth, or match a victim to his dental x-rays Results in an identification of an unknown individual Forensic Engineering Used to analyze construction accidents, and the causes and origins of fires or explosions
Slide 31 - Forensic Analysis Can include organic and inorganic analytical techniques Organic analysis of unknown substances Includes analytical techniques such as Chromatography, UV- visible and infrared Spectrophotometry and Mass Spectrometry. Inorganic analysis Includes techniques such as the emission spectrum of elements, Atomic Absorption Spectrophotometry, Neutron Activation Analysis, and X-Ray Diffraction Analysis.
 

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