Questioned document examination
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In forensic science, questioned document examination (QDE) is the examination of documents potentially disputed in a court of law. Its primary purpose is to provide evidence about a suspicious or questionable document using scientific processes and methods. Evidence might include alterations, the chain of possession, damage to the document, forgery, origin, authenticity, or other questions that come up when a document is challenged in court.
Ransom note left at the site of the Lindbergh kidnapping
The printer used to print a document can be forensically established using the Machine Identification Code.
A £5 note (White fiver) forged by Sachsenhausen concentration camp prisoners as part of Operation Bernhard
Photo of victim Bryan Hartnell's car door, onto which the Zodiac Killer wrote details of his attack upon Hartnell and Cecelia Shepard
Forensic science
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Forensic science, also known as criminalistics, is the application of science principles and methods to support legal decision-making in matters of criminal and civil law.
Ambroise Paré's surgical work laid the groundwork for the development of forensic techniques in the following centuries.
This is an example and explanation of extractor/ejector marks on casings.
Apparatus for the arsenic test, devised by James Marsh
Fingerprints taken by William Herschel 1859/60