Where Do the Statistics for the UCR Program Come From?
In 2013, FBI UCR data were compiled from more than 18,000 law enforcement agencies, representing more than 98% of the population in the United States. Although reporting by law enforcement is not mandated, many states have instituted laws requiring law enforcement within those states to provide UCR data. The statistics in the UCR Program are based on arrest reports. These arrest reports are broken down by the type of crime for cities, counties, states, and regions of the country. In addition, the FBI collects auxiliary information about these offenses, such as the time of day of burglaries. The expanded offense data include trends in both crime volume and crime rate per
100,000 inhabitants. In regard to homicides, the UCR Program collects expanded homicide data, which includes information about homicide victims and offenders, weapons used, the circumstances surrounding the offenses, and justifiable homicides.
UCR and Violent Crime
Violent crime is composed of four offenses: murder and nonnegligent manslaughter, rape, robbery, and aggravated assault. Violent crimes are defined in the UCR Program as those offenses that involve force or threat of force.