Is the Criminal Justice System Racially Biased? Most criminologist use two sources of criminal justice data in the United States: the Uniform Crime Reports (UCR) and the National Crime Victimization Surveys (NCVS). The URC data is made from law enforcement agencies and include crime incidents reported to or obtained by the police. NCVS data is obtained from a very complex national survey of a sample of homes and provide information about crime incidents and victims for both reported and unreported crimes, excluding homicide. For my report I obtained research information from questionnaires and from several text books. I gave the questionnair