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The Forensic Document Unit provides an extensive range of tests. These include the examination of handwriting in an attempt to identify or eliminate a writer to a document in question, authentication of documents (e.g. checks, vehicle titles, driver licenses) and development of indented writing impressions on documents. Examinations also include attempting to determine the sequence of events on documents, edge to edge (fracture) exams, decipherment of altered/obliterated and charred documents to determine the original text, microscopic examinations of printed documents (e.g. fax and photocopier) to determine source, and examination of mechanical impressions (e.g. typewriter, wet and dry seals).