I received an email from Tom Adair yesterday. Tom is a retired, internationally recognized, forensic scientist/CSI in Colorado (US).
Tom recently launched an informative blog (http://forensics4fiction.wordpress.com).
He explains the basics of forensics for authors of all experience levels. He has just started a section on historical forensics, and will soon add some fun categories for the science fiction and fantasy/paranormal writers as well. Tom is happy to answer questions about forensics and law enforcement in general so feel free to flick him an email if the need arises.
WARNING: Content is addictive reading! I highly recommend you take a look.