Authorship identification in the news
One of the curious things about the uses of linguistics in the legal context is that the smallest units of language get the most public attention. Linguists analyze language in all its shapes and forms, from minute sounds to broad discourse structures, but the media's interest is on the smaller language units like letters, punctuation, and words, not the larger language units like syntax, discourse structure, and conversational strategies.
A case in point is the area of authorship identification, which typically focuses on small language units such as morphology, lexicon, or stylistic choices found in evidence documents. It's tempting to think that such language features can actually identify authors with as much validity and precision as the way DNA analysis helps law enforcement identify suspects. Personally, I have some reservations about what I see linguists doing as they try to help the police and the courts determine issues of innocence or guilt.
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