John Olsson & June Luchjenbroers 
Forensic Linguistics [PDF ebook] 

Now in its third edition, this practical introduction to forensic linguistics is required reading for students of language and the law. It includes: new chapters on identifying forensic texts and important interactional aspects of the language used in legal contexts an additional chapter on forensic phonetics by Harry Hollien, a world renowned forensic phonetician an appendix of forensic texts for student study, and even more exercises and suggestions for further reading a companion website with a repository of statements, notes and examples referred to throughout the text.