CSI is a three-letter abbreviation that stands for: Crime Scene Investigator. A Crime Scene Investigator is part of a highly educated team of people who investigate a crime scene and look for evidence.

Forensic Science

Forensic science (often shortened to forensics) is the application of a broad spectrum of sciences to answer questions of interest to the legal system. This may be in relation to a crime or to a civil action. The use of the term "forensics" in place of "forensic science" could be considered incorrect; the term "forensic" is effectively a synonym for "legal" or "related to courts" (from Latin, it means "before the forum"). However, it is now so closely associated with the scientific field that many dictionaries include the meaning that equates the word "forensics" with "forensic science."

Forensic comes from the Latin word "forensis" meaning forum. During the time of the Romans, a criminal charge meant presenting the case before a group of public individuals. Both the person accused of the crime and the accuser would give speeches based on their side of the story. The individual with the best argumentation and delivery would determine the outcome of the case. In other words, the person with the best forensis skills would win.

Subdivisions of Forensic Science

• Forensic accounting is the study and interpretation of accounting evidence.
• Forensic anthropology is the application of physical anthropology in a legal setting, usually for the recovery and identification of skeletonized human remains.
• Forensic economics is the study and interpretation of economic damage evidence to include present day calculations of lost earnings and benefits, the lost value of a business, lost business profits, lost value of household service, replacement labor costs and future medical care costs.
• Forensic engineering studies the causes of failure of devices and structures.
• Forensic epistemology deals with philosophical knowledge in a legal setting, typically for understanding behavior of states.
• Forensic linguistics deals with anything in the legal system that requires linguistic expertise.
• Forensic psychology and forensic psychiatry deal with the legal aspects of human behavior.
• Forensic science using science to create an argument in places such as court.
• Forensic biology performs serological and DNA analysis of physiological fluids for the purpose of identification and individualization.
• Forensic serology is the application of the study of blood, semen, saliva and other body fluids to legal matters.
• Digital forensics deals with the digital evidence (e.g. e-mail, photos stored on a computer).

Applications and Subdivisions of Forensic Science

Criminalistics is the application of various sciences to answer questions relating to examination and comparison of biological evidence, trace evidence, impression evidence (such as fingerprints, footwear impressions, and tire tracks), controlled substances, firearms, and other evidence in criminal investigations. Typically, evidence is processed in a crime lab. This is the division of forensic science most often reported in the media and depicted in popular fiction.

Some of the other forensic science disciplines are:

• Forensic entomology deals with the examination of insects in, on, and around human remains to assist in determination of time or location of death. It is also possible to determine if the body was moved after death.
• Forensic geology deals with trace evidence in the form of soils, minerals and petroleums.
• Forensic odontology is the study of the uniqueness of dentition better known as the study of teeth.
• Forensic photography is the art of producing an accurate photographic reproduction of a crime scene for the benefit of a court.
• Forensic toxicology is the study of the effect of drugs and poisons on/in the human body.
• Forensic firearms examination is the science dealing with the investigation of use of firearms and ammunition.
• Questioned document examination is the study and interpretation of evidence that takes the form of a document, including handwriting and printmaking.

History of Forensic Science

The "Eureka" legend of Archimedes (287-212 BC) can be considered an early account of the use of forensic science. In this case, by examining the principles of water displacement, Archimedes was able to prove that a crown was not made of gold (as it was fraudulently claimed) by its density and buoyancy.

The earliest account of fingerprint use to establish identity was during the 7th century. According to Soleiman, an Arabic merchant, a debtor's fingerprints were affixed to a bill, which would then be given to the lender. This bill was legally recognized as proof of the validity of the debt.

The first written account of using medicine and entomology to solve (separate) criminal cases is attributed to the book Xi Yuan Ji Lu (????, translated as "Collected Cases of Injustice Rectified"), written in 1248 China by Song Ci (??, 1186-1249). In one of the accounts, the case of a person murdered with a sickle was solved by a death investigator who instructed everyone to bring their sickles to one location. Flies, attracted by the smell of blood, eventually gathered on a single sickle. In light of this, the murderer confessed. The book also offered advice on how to distinguish between a drowning (water in the lungs) and strangulation (broken neck cartilage).

In sixteenth century Europe, medical practitioners in army and university settings began to gather information on cause and manner of death. Ambroise Paré, a French army surgeon, systematically studied the effects of violent death on internal organs. Two Italian surgeons, Fortunato Fidelis and Paolo Zacchia, laid the foundation of modern pathology by studying changes which occurred in the structure of the body as the result of disease. In the late 1700s, writings on these topics began to appear. These included: "A Treatise on Forensic Medicine and Public Health" by the French physician Fodéré, and "The Complete System of Police Medicine" by the German medical expert Johann Peter Franck.

In 1775, Swedish chemist Carl Wilhelm Scheele devised a way of detecting arsenous oxide, simple arsenic, in corpses, although only in large quantities. This investigation was expanded, in 1806, by German chemist Valentin Ross, who learned to detect the poison in the walls of a victim's stomach, and by English chemist James Marsh, who used chemical processes to confirm arsenic as the cause of death in an 1836 murder trial.

Two early examples of English forensic science in individual legal proceedings demonstrate the increasing use of logic and procedure in criminal investigations. In 1784, in Lancaster, England, John Toms was tried and convicted for murdering Edward Culshaw with a pistol. When the dead body of Culshaw was examined, a pistol wad (crushed paper used to secure powder and balls in the muzzle) found in his head wound matched perfectly with a torn newspaper found in Toms' pocket. In Warwick, England, in 1816, a farm laborer was tried and convicted of the murder of a young maidservant. She had been drowned in a shallow pool and bore the marks of violent assault. The police found footprints and an impression from corduroy cloth with a sewn patch in the damp earth near the pool. There were also scattered grains of wheat and chaff. The breeches of a farm laborer who had been threshing wheat nearby were examined and corresponded exactly to the impression in the earth near the pool. Estimating the time of death has proved to be a good source for narrowing down who is responsible for the murder of a particular person.

Forensic Science in the Media

Sherlock Holmes, the fictional character created by Sir Arthur Conan Doyle in works produced from 1887 to 1915, used forensic science as one of his investigating methods. Conan Doyle credited the inspiration for Holmes on his teacher at the medical school of the University of Edinburgh, the gifted surgeon and forensic detective Joseph Bell.

Decades later, the comic strip, Dick Tracy also featured a detective using a considerable number of forensic methods, although sometimes the methods were more fanciful than actually possible. Popular television series focusing on crime detection, including CSI: Crime Scene Investigation, CSI: Miami, CSI: NY, NCIS and Bones depict glamorized versions of the activities of 21st Century forensic scientists. These related TV shows have changed individuals' expectations of forensic science, an influence termed the "CSI effect".

In the video game Phoenix Wright: Ace Attorney, forensic science is used in various cases.

The second incarnation of the comic book character The Flash also worked as a forensic scientist in his civilian identity.

Information Courtesy of Wikipedia, the free encyclopedia