events in incident count tabulations. However, the NCVS practice differs from the UCR rule in that “the NCVS collects and preserves information for each crime occurring in the incident, which enables researchers to create their own classification scheme;” in comparison, application of the UCR hierarchy rule collapses incidents involving several crime types to record just one type, losing the full incident detail.

Supplemental Reports

In the Summary Reporting System, participating agencies are asked to report counts of all Part I offenses known to law enforcement on a standard, monthly form known as Return A. However, Return A is not the only data collection requested by the FBI. The Summary Reporting System also asks participating agencies to complete additional forms, at various intervals:

  • Age, race, and sex arrest data: On a monthly basis, agencies are asked to provide counts of completed arrests by the age, race, and sex of the arrestee(s). Specifically, the age, sex, and race breakdowns are required for arrests for each of the Part II offenses, making these data the UCR’s only systematic source of information on these offenses as well as the only source of offender attributes.1

  • Law enforcement officers killed and assaulted: Data collected annually since 1972.

  • Hate crime statistics: The Hate Crime Statistics Act of 1990 led to the collection of a variable on “bias motivation in incidents in which the offense resulted in whole or in part because of the offender’s prejudice against a race, religion, sexual orientation, or ethnicity/national origin” (Federal Bureau of Investigation, 2004:3). The scope of hate crimes reported in this series was expanded in 1994 to include crimes motivated by victims’ physical or mental disability.

  • Supplementary homicide reports: Since 1962, reporting agencies have also been asked to complete Supplementary Homicide Reports (SHR).


The 21 offenses currently tallied as Part II offenses are other assaults; forgery and counterfeiting; fraud; embezzlement; stolen property (buying, receiving, possessing); vandalism; weapons (carrying, possessing, etc.); prostitution and commercialized vice; sex offenses; drug abuse violations; gambling; offenses against the family and children; driving under the influence; liquor laws; drunkenness; disorderly conduct; vagrancy; all other offenses; suspicion; curfew and loitering laws (persons under 18); and runaways (persons under 18) (Federal Bureau of Investigation, 2004:8).

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