Authorship examination requires free, conditionally free or experimental samples. The closer the samples are to the disputed text in genre, time, subject and circumstances of creation, the more valuable they are.
Formulaic phrases and very short messages often limit the scope of the examination.
What you can do
- collect the disputed text and its context;
- select comparable samples from the presumed author;
- formulate appropriate questions for the expert;
- prepare a specialist opinion or an expert report review.