These textbooks are freely available for you to use as reference or in a classroom.
Open Textbook Library: Law - compilation of open access textbooks from the Open Textbook Library related to law; there are several titles related to criminal justice specifically
OER Commons: Criminal Justice - compilation of open access textbooks from OER Commons related to criminal justice
Introduction to Criminal Investigation: Processes, Practices and Thinking - "a teaching text describing and segmenting criminal investigations into its component parts to illustrate the craft of criminal investigation"
Introduction to the Criminal Justice System - covers the main aspects of the criminal justice system, as well as some policy and theory
Introduction to Human Osteology - "...designed for use in the human osteology laboratory classroom. Bones are described to aid in identification of skeletonized remains in either an archaeological or forensic anthropology setting. "
Show Me Criminal Procedure - "...an open educational resources casebook available for free to students. "