Document examination expert witness Ronald N. Morris is a certified forensic document examiner and in this excerpt from Submitting a Handwriting Case for Examination, he answers the question:
What is questioned writing?
A questioned writing is any writing written by an unknown writer whose identity must be determined. The questioned writing may consist of a single or multiple signatures, numerals, cursive, or hand printing in the form of letters, forms, etc.
Questioned writing can have one or more of the following characteristics that will effect its suitability for comparison purposes:
a. Naturally written b. Un-natural and/or disguised writing c. Writing written in more than one style d. Limited in quantity and quality e. Written by one or more writers f. A tracing or simulation of another’s writing