four sources measuring offending/victimization
1. UCR (Uniform Crime Report, 1930s): local law officers report known cases of crime (# of crimes, # offenders arrested), given directly from law enforcement; not every local crime is reported, discretion varies by locality
2. NCVS (National Crime Victimization Survey, 1972): 2x annual reports, victims/past offenders willing to report anonymously (uncover dark crime), no report error from citizens to police; not getting info from 11 y/o or older, only 90,000 households surveyed, inaccuracies reported as fact, surveys contain confusing jargon
3. Self-Reported Surveys (1976ish): personal interviews, won't get in trouble if admitting to participation in criminal activity (uncover dark crime), law enforcement gains info on some victimless crimes; subject to bias, not always honest in fear of being convicted
4. NIBRS (National Incident-Based Reporting System, 1989): collects data in categorized offenses (detailed descriptions on criminal behavior patterns), covers state and national statistics; relies on officer accountability to report crimes accurately, only 33 states use, state statute and NIBRS plans don't always align