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GlossaryCrime reporting systems

Unreported crime

Unreported crime is criminal activity absent from the specified reporting source. Learn how surveys study nonreporting and what police data cannot establish.

Unreported crime is criminal activity that was not reported to, or captured by, the specified source. In common crime-measurement usage, it refers to crime not reported to police. The source must be named: an event can be absent from police records yet described in a victimization survey.

Absence from records is a measurement limit

Police statistics depend on events coming to official attention and meeting the reporting program's requirements. They cannot directly count every offense that never reaches that system. This gap is sometimes called the dark figure of crime, meaning activity outside the observed administrative count, not a known inventory of individually verified hidden cases.

The National Crime Victimization Survey addresses part of this problem by asking respondents about covered experiences and whether they were reported to police. It also collects reasons for reporting or not reporting. The survey includes specified nonfatal personal and household property crimes, so it does not estimate every kind of unreported offense. BJS NCVS description

The survey's weighted estimates provide evidence at the populations and levels supported by its design. They do not reveal the exact number of hidden incidents in every local jurisdiction or identify an unreported offender in a particular case.

Example

Hypothetical example: A person experiences a qualifying theft and does not contact police because they believe the property will not be recovered. During a survey interview, they describe the event and state that it was not reported.

The experience can contribute to the survey's estimate of nonreported victimization. It remains absent from the police incident file unless someone separately brings it to the agency's attention. The survey estimate and police count therefore measure different views of the covered activity.

Common confusion

Unreported crime is different from an agency's missing statistical submission. In the latter case, police may already have a local report, but the national collection lacks it. That is a participation or data-transfer gap, not necessarily a victim's nonreporting.

An offense that is unfounded is also different: the source has made a determination about the allegation. Simply lacking a record does not establish whether an alleged event occurred or whether it was criminal.

Avoiding unsupported adjustments

Do not multiply a local police total by a general national nonreporting percentage and present the result as a precise local crime count. Reporting patterns vary by offense and population, and survey uncertainty remains. Similarly, an estimate adjusting for agencies that did not submit data does not automatically account for offenses never known to police. The estimation target must explicitly establish what missing activity it addresses.

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