The forensic document examiner conducts scientific examinations, comparisons, and analyses of documents in order to: (1) establish genuineness or nongenuineness, or to reveal alterations, additions, or deletions, (2) identify or eliminate persons as the source of handwriting, (3) identify or eliminate the source of machine produced documents, typewriting, or other impression marks, or relative evidence, and (4) preserve and/or restore legibility.  They also write technical reports and give expert testimony.