When cases of anonymous writing such as threatening letters, graffiti, or notes of any kind for which a determination of authorship is required, Bureau Forensic Document Examination can provide comparisons of the anonymous writing to a group of possible writers who had means, motive, or access to write the unknown sample.
Determining how many authors are contained in an anonymous writing incident is often useful. Conducting a comparative study with possible authors can also provide insight into an identification, assuming the author is contained in the supplied sample set of potential writers. It is important to allow the examiner access to all possible writers based on the circumstances of the situation. Allow the examiner to exercise the expertise in order to isolate the writer and resist the urge to do her job for her by limiting the sample set of possible authors based on inexperienced writing comparisons.