A police case number is the number identifying a specific incident in the police records system, according to the City of Minneapolis. This allows persons affected by the incident to request a police report to receive information on the incident that is legally available for release.
Procedures for releasing police reports vary depending on the identity of the person requesting the report and whether or not the persons involved in the incident are pressing charges, notes Washington Courts. If no charges have been filed, those wishing to obtain a police report should contact the police department that wrote the report and ask how to obtain a copy of the report. If charges have been filed, those who wish to obtain a police report should contact the prosecutor's office. Specific procedures to request a police report may vary by state.