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Questioned Document Examinations
Examinations are conducted on questioned documents in all types of criminal cases for local, state, and federal agencies. This includes the examination of writing, printing, ink, paper, impressions, typewriting, typewriters, checkwriters, photocopiers, alterations, obliterations, reconstructing torn, faded, charred, burned, or water soaked documents, to name a few. Laboratory reports are issued to submitting agencies, and expert testimony is given in various court proceedings. Some of the examination areas are:
Writing and Printing
Writing and printing is examined to attempt to identify or eliminate a writer. It is possible for writing to be identified or eliminated with known persons writing samples. Writing and printing is examined and compared with writing samples of known individuals in order to determine whether or not they wrote a particular document in question. Writing cannot be analyzed for any type of personality trait; this practice is called graphology and falls outside recognized forensic sciences.
Ink can be examined to determine if different inks were used to produce a particular document in question. Inks that have been obliterated or destroyed through fading, burning, water, overwriting, chemicals, or other means can often be recovered and made legible. Although the Michigan State Police Questioned Document Unit does not offer ink age determination, arrangements can be made to have this type of examination conducted at a federal laboratory.
Photocopiers, Printers, Mechanical Devices and Unusual Documents
Any mechanical items used to produce documents can be examined and compared with the document in question. The actual device (or known samples from the device) is submitted for examination to determine if the particular device was used to produce a document in question.
Some examples of unusual "documents" are: writing in blood, spray painted messages on buildings, writing, tattoos, stamps or other potentially identifying markings on human skin, matches found at the scene of a crime for comparison with a known matchbook.
Paper and Typewriters
Typewritten documents can be identified with a particular typewriter. Typewriting can also be classified to determine what type of machine was used to produce the document. In addition, typewriter ribbons, correction ribbons, and correction materials can be examined to determine if these materials were used to produce the document in question.