Lee Lofland is a retired police officer. Now an author himself - he writes mysteries and investigation how-to books.
His Graveyard Shift blog is one of my favorites. He always posts interesting and useful information that I, as a mystery writer, find extremely valuable.
My daughter (and fellow author), Jennifer, and I had a lot of fun writing a guest post on Lee Lofland's blog "The Graveyard Shift"
Be sure to check it out!!