In case he's a candidate for good books on the subject, some of the best I've read on that topic are 'Best Evidence', 'Rush to Judgement' (I enjoyed it the most...Lipton, I believe is the author), and 'Six Seconds in Dallas'.
Bear in mind, this is 15 or so years ago, and better ones may be available now, but very good books, all.
Thanks JRA, I'll pass the info along.