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forensic speechreading
Forensic speechreading (or forensic lipreading) is the use of speechreading for information or evidential purposes. Forensic speechreading can be considered a branch of forensic linguistics. In contrast to speaker recognition which is often the focus of voice analysis from an audio record, forensic speechreading usually aims to establish the ''content'' of speech, since the ''identity'' of the talker is usually apparent. Often, it involves the production of a transcript of lipread video-records of talk that lack a usable audiotrack, for example CCTV material. Occasionally, 'live' lipreading is involved, for example in the Casey Anthony case. Forensic speechreaders are usually deaf or from deaf families (CODA), and use speechreading in their daily lives to a greater extent than people with normal hearing outwith a deaf community. Some speechreading tests suggest deaf people can be better lipreaders than most hearing people.
== Speechreading expertise ==
No tests of speechreading have yet been developed in a forensic context: that is, to benchmark individual skills in speechreading from a video record, including production of a reliable transcript. For many years, UK agencies made extensive use of one particular speechreader, whose reports are now not to be used for evidential purposes. Several speechreaders and deaf professionals currently offer these services. In the UK,these include Terry Ruane, (Laraine Callow MBE ),(Tina Lannin ) among others. In the US, (Consuelo Gonzalez ) is a leading lipreading expert. Expert speechreaders may be able to advise on various issues, including whether a videorecord is or is not speechreadable, and the accent and language used by a talker. Commissioning agents need to be aware of issues inherent in the unreliability of speechreading, and be prepared to treat such advice with caution.
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