Questions of forensic linguistics

It is clear that linguistics evidence can play a crucial role in investigating a crime. So sometimes the linguistics evidence in a case is obvious. So I would like to present fundamental questions asked about language-based evidence. All questions are focused on reflecting a case. Often the crucial investigative issues are

1. author/speaker identification: Who authored this document? Who spoke this voicemail message?

2. text similarity: Are these texts or screen names related to each other? Are these trademarks too similar? Are these manuals too close for comfort?

3. text typing: Is this document really what it purports to be --- is it a real suicide note, a real threat letter, a real confession, a real predatory chat, etc?

4. linguistic profiling: What can be determined about the author’s background from this text?

Generally Forensic linguistics is a new-born science which makes connection between linguistics and the law. For this reason it doesn't have terminology. But there are the new approaches:

- terrorism cases
- cross-cultural communication
- similarities in large corpora
- multimodal aspects of victim's narrative

I'm very interested in this branch of linguistic so I would like to read a book about it.Unfortunately, in Poland there isn't this type of book.