How do forensic scientist help prove someone innocent or guilty?

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Forensic science and the justice

The use of forensic science helps the police solve crimes , convict the guilty , and exonerate the innocent . Forensic science is part of almost every criminal investigation from the discovery , collection preservation , and analysis of physical evidence to the conviction of the guilty . Forensic science is the application of science to law . In its broadest sense , forensic science becomes part of almost every law ADDIN EN .CITE Trimm20051 116Harold Henry TrimmForensics the Easy Way2005Barron ap

os s Educational Series (Trimm There is no denying the power of fingerprints and forensic DNA evidence to exculpate innocent suspects and incriminate the guilty , potentially assisting with certain detection of criminal offences . However , these forensic identification techniques may also in late-modern society precautions are increasingly taken that do not attempt to `balance risks , but seek to avoid risks (at the cost of potentially creating other risks . the identification and verification of the identity of the suspects is not the only purpose for which bodily samples are demanded by law-enforcement authorities but for proof of commission of a crime ADDIN EN .CITE McCartneyCarole McCartneyForensic Identification And Criminal Justice : Forensic Science , Justice and Risk2006Willan Publishing (McCartney . In Europe , LIVESCAN consoles enable officers to determine the identity of suspects (who have fingerprints stored on the national fingerprint database , IDENT1 , circumventing the need to rely upon the suspect 's honesty : these will ensure that anyone arrested and wanted in connection with previous offences is quickly identified . More than 100 ,000 records of arrests are made , and 80 ,000 scenes-of-crime marks are searched every month , with on average 4 ,000 `identifications ' made in an automated process which has dramatically shortened the time taken to perform such tasks . Similar advances are also available in U .S . such as the Automated Fingerprint Identification System (AFIS ) or the recently created and rapidly expanding CODIS system , linking American state and federal DNA data banks ADDIN EN .CITE Kiely20066 666Terrence F KielyForensic Evidence Science And the Criminal Law2006CRC Press (Kiely

Criminal investigation and forensic science

The objectives of any crime scene investigation are the recognition collection , interpretation , and reconstruction of all the important physical evidence at a crime scene . The forensic pathologist who works at a forensic laboratory examines the physical evidence to provide the investigator with information necessary for the case to be solved . The basis of scientific crime scene investigation is formed through the integration of the crime scene investigation with the forensic examination of the scene 's physical evidence . These are examples of types of information obtained from the examination of physical evidence in a crime investigation : Information on the Corpus Delicti - this is the crucial facts or data of an investigation - the physical evidence the pattern of the evidence , and the laboratory examination results of the evidence . Information of the Modus Operandi - usually , most of the criminals repeat their behavior and a certain behavior eventually becomes a criminal 's signature ' or method of operation Linkage of persons , scenes , and objects...