Often a questioned document examiner is called upon as a handwriting analyst rather than for signature analysis. In handwriting analysis forensics forensic document examiner must compare the handwriting in question with the handwriting of a suspected writer. In this case there is a question whether the person who wrote several other pages of the document also wrote the text between the lines on one page.

In this example the forensic analysis was performed by extracting words from other pages in the document and comparing them with the same word written in the interlineation. The words were color-coded to help identify them on the page and in the interlineation writing.