Criminal Justice books can be located in Sociology or Law. These are Library of Congress subject headings that may help you refine your search topics.:
H: Social Sciences (General)
HV: Social pathology. Social and public welfare. Criminology.
HV6035-6197: Criminal anthropology.
HV6201-6249: Criminal classes.
HV6250-6250.4: Victims of crimes. Victimology.
HV6251-6773.55: Crimes and offenses.
HV6774-7220.5: Crimes and criminal classes.
HV7231-9960: Criminal justice administration.
HV7428: Social work with delinquents and criminals.
HV7431: Prevention of crime, methods, etc.
HV7435-7439: Gun control.
HV7551-8280.7: Police. Detectives. Constabulary.
HV8290-8291: Private security services.
HV8301-9920.7: Penology. Prisons. Corrections.
KF: Law of the United States
KF1-9827: Federal law. Common and collective state law.