This author uses a rather casual style filled with the author's own biases as it relates to criminal "profiling." To the casual reader this textbook leaves out several historical facets to criminal investigating. Also, it leaves the reader questioning what are truly the qualifications one must possess to be a criminal "profiler." The author has a history in "profiling" that is up for questioning by several legitimate forensic agencies and professional societies--read at your own risk.Opinion only.