Dr Tim Grant, Deputy Director of the Centre for Forensic Linguistics at Aston University (UK), is well known in forensic linguistic circles. ScienceDaily has excerpts from an interview with Dr. Grant following the successful conviction of a murderer that relied partly on Dr. Grant's testimony about text messages allegedly sent by the suspect (since convicted) to throw investigators off the trail. I call your attention to the careful and correct use of the phrases "unlikely" and "more likely" to describe the results of the analysis, instead of a phrase such as "proved conclusively".
In addition, here is a link to a BBC (British Broadcasting Corporation, UK) news story about the case and the analysis of the text message evidence. Very interesting stuff!