Forensic ScienceThe idea of ​​using science was started before the debut of Sherlock Holmes in 1887, who introduced forensic science to aid criminal investigations. Throughout history, the work of forensic scientists has been performed by medical personnel. Until the end of the 18th century, the attempts of the French doctor-jurist Antoine Louis, the Chinese crime-solving book “Hsi Duan Yu” (the way to wash away wrongs), etc., provided ideas on determining the time of death , on the analysis of bloodstains, on the identification of chemical substances used in crime, etc. After the 18th century, modern chemistry opened new ways to identify crime such as the idea of ​​measuring height, right ear length and outstretched arm of the Frenchman Alphonse Bertillon (1853-1914). Likewise, the further development of methods such as fingerprinting by Francis Galton (1822-1911), the analysis of blood samples to identify crime by Dr. Karl Landsteiner (1868-1943), the development of interrogative document examination by laser pioneer Albert S. Osborn the application of Menzel in the 1970s and DNA printing by Alec Jeffrey in 1985 bring revolutionary changes in criminal justice. This amazing story is responsible for the short track of the development of crime and the expansion in the identification of various types of crimes. In the modern period, crime laboratory has become so popular in criminal investigation that it largely depends on the circumstances of the crime, types of crime, social nature, community size, available facilities and funding and so on. In modern forensic science, crime laboratories include photographic section, evidence storage section, identification section, chemistry section,...... half of the document ......n analytical evidence such as DNA , coatings, fluids, serology, etc. They are significant things that help in collecting every data or event from the crime scene to identify the criminals. Its three key actions assist law enforcement, significantly reduce the occurrence of wrongful convictions, and improve the nation's internal security. Works Cited http://www.ncjrs.gov/pdffiles1/nij/grants/228091.pdf2) Author: Nickel & Fischer (1998), Crime Science, Forensic Detection Method (pp: 1-9). Print: University press of Kentucky3) Author: Clarence Gerald Collins (1995), Finger Print Science (pp: 163, 5). Print: Copper House Publishing Company4) Author: David E Newton (2007), Forensic Chemistry (pp: 1-7,138,140,142,165). Print: InfoBase Publishing5) David Owen (2000), Hidden Evidence (pp: 218,226,227). Printing: Firefly Books Inc.