While being aware that most crime does go unreported, it is still important to estimate and attempt to measure crime in the country. However, it is essential always to be aware of the data sources’ strengths and weaknesses when reading crime statistics. Also, we must be cautious of how changing data collection techniques may alter statistics. For example, if a survey never collected data on prescription drug use – but then all of a sudden does – it could seem like prescription drugs are suddenly being misused at high rates. However, without longitudinal (or longer term, historical) data, we cannot make this assumption.

Official crime statistics are gathered from various criminal justice agencies, such as the police and courts, and represent the total number of crimes reported to the police or the number of arrests made by such agencies. We should keep in mind that the “dark figure of crime” is not only driven by victims’ decision not to report. Remember, if an officer uses discretion and does not arrest a person (while knowing a crime was committed), this inaction contributes to the “dark figure.”

The Federal Bureau of Investigation’s (FBI’s) Uniform Crime Reports (UCR) is the largest, most commonly-used source of official crime statistics to date. The UCR counts the number of crimes that are reported to the police, and the number of arrests made, each year. This link below can take you to the UCR homepage: https://www.fbi.gov/services/cjis/ucr.

The UCR Program’s primary objective is to generate reliable information for use in law enforcement administration, operation, and management. Various groups and agencies rely upon the UCR crime data, such as law enforcement executives, students, researchers, the media, and the public at large seeking information on crime in the nation. ^[1] The UCR was begun in 1929 by the International Association of Chiefs of Police, to meet the need for reliable uniform crime statistics for the nation. In 1930, the FBI was tasked with collecting, publishing, and archiving those statistics. Every year there are four annual publications produced from data received from more than 18,000 city, university and college, county, state, tribal, and federal law enforcement agencies who voluntarily participate in the program. ^[2]

FBI Uniform Crime Report (UCR) Part I Index Crimes

The UCR Program consists of four data collections: The National Incident-Based Reporting System (NIBRS), the Summary Reporting System (SRS), the Law Enforcement Officers Killed and Assaulted (LEOKA) Program, and the Hate Crime Statistics Program. The UCR also publishes special reports on Cargo Theft, Human Trafficking, and NIBRS topical studies. The UCR Program also manages the (relatively) new National Use-of-Force Data Collection, which captures incidents of police violence and use-of-force reported nationwide. Importantly, the decision to develop this new dataset was driven by grassroots activism around police killings of unarmed civilians, and particularly, Black citizens. Nevertheless, this databased remains limited in its accuracy at present, as only 61% of law enforcement agencies are currently participating.

National Incident-Based Reporting System, or NIBRS

The National Incident-Based Reporting System, or NIBRS, was created to improve the overall quality of crime data collected by law enforcement. NIBRS is unique because it collects data on crimes reported to the police, but also incidents where multiple crimes are committed in the same “episode,” for example, when a robbery escalates into a rape. ^[3] NIBRS also collects information on victims, known offenders, relationships between victims and offenders, arrestees, and property involved in the crimes. Use this link to go directly to NIBRS: https://www.fbi.gov/services/cjis/ucr/nibrs

Hate Crime Statistics 

Congress passed the Hate Crime Statistics Act, 28 U.S.C. § 534, on April 23, 1990.  This required the attorney general to collect data “about crimes that manifest evidence of prejudice based on race, religion, sexual orientation, or ethnicity.” Hate crime statistics may assist law enforcement agencies,  provide lawmakers with justification for certain legislation, provide the media with credible information, or simply show hate crime victims that they are not alone (FBI, 2018). Use this link to visit the FBI’s hate crime statistics: https://www.fbi.gov/services/cjis/ucr/hate-crime.

Law Enforcement Officers Killed and Assaulted Program (LEOKA)

LEOKA provides data (and training resoucrces) that help keep law enforcement officers safe, by providing relevant, high quality, potentially lifesaving information to law enforcement agencies focusing on why an incident occurred as opposed to what occurred during the incident, with the hope of preventing future incidents. ^[4]

Map of law enforcement officers deaths, by region, 2022 (updated 9/1/22)

All of these official statistics are a great starting point, although, recognize they are imperfect in nature. Police agencies can change their attention to certain events, which can change the overall number of arrests. For example, if police begin cracking down on domestic violence, the statistics may go up. This crackdown can make it appear that the problem has increased, although it can be related to the crackdown. Similarly, if the rate of victim reporting for certain offenses increases, the reported crime rate will also rise – even if the “underlying” level of crime has not change. Just remember, if the crime is not reported, or no arrest is made it will not get captured in the data.