This unusually complete career book offers a thorough and very readable survey of the various agencies, federal, state and local, which enforce the law. The differences between them, especially in terms of the qualifications and training of their personnel, is especially well presented with anecdotal histories and asides. The FBI is given the greatest number of chapters, but only because the author has approached that department with a view toward describing the career specialties (scientific and technical) within it. The possibilities of advancement, up to and including the administration level, in each agency is also described. There is a list of sources of further vocational information and a hard-to-find list of the colleges offering courses and/or degrees in law enforcement. Very well done.