The Criminal Investigative Function: A Guide for New Investigators by Joe Giacalone.
I loved reading this textbook. It was straight and to the point, and it provided a lot of information.
From reading this book I have learned about the protocols on handling a crime scene, conducting interviews and interrogations, search and seizures, but most of all, the real challenges that face investigators and their responsibilities to a case.
Not only is this a good tool for new investigators to use; it is also a helpful resource book for us crime writers.
Feel free to find out more about the author by visiting his website at JoeGWrites.com. There you will also find a link to order his book.