“Questioned documents” are pieces of writing whose authorship is in dispute and are the focus of forensic linguistic analysis. In casework the analyst compares the style of these documents with the known writing of potential suspects, providing an opinion on which suspect’s style is more consistent with the questioned text and demonstrating points of comparative distinctiveness. This approach is most appropriate when the investigation is a closed‑set problem, meaning the set of possible authors is known and includes the true author. The linguist must verify that the closed‑set assumption is valid and frame any conclusions conditionally, noting that the responsibility for defining the author set lies with investigators, not the linguistic analysis.
Definition drawn from Methodologies and Challenges in Forensic Linguistic Casework (Picornell, Perkins & Coulthard, eds.). Extracted text: /Volumes/mu-not/projects/zodiac/books/methodologies_and_challenges_in_forensic_linguistic_casework/methodologies_and_challenges_in_forensic_linguistic_casework.txt.
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