Forensically speaking.

Psychology & Crime News has an interesting post about forensic linguistics in crime detection.  Using forensic linguistics in the criminal justice system, P&CN, 28 February 2009.

John Olsson of the Forensic Linguistics Institute is one of the UK’s most experienced forensic linguists, with over
300 criminal cases in his portfolio. He kindly agreed to answer a few
questions about how forensic linguistics contributes to solving crimes.
You can find out more about John and his work over at his comprehensive
website.