Uniform Crime Reporting Survey (UCR)

Additional documentation

  • UCR Data Accuracy Footnote

    In 2001, a discrepancy in methodology applied by the forces in the province using the Ontario Municipal & Provincial Police Automated Co-operative (OMPPAC) system was detected. These forces report approximately one-third of the total criminal incidents for the province and include the OPP and about 60 small and mid-sized municipal forces. This discrepancy resulted in an over-count of less serious criminal incidents. A similar problem with data from Toronto Police was detected in 1992. During 2003 and 2004, the Canadian Centre for Justice Statistics (CCJS) consulted with affected police services and analyzed both historical aggregate UCR data and more recent UCR2 microdata to determine the impact of this over-reporting. For further information, readers should refer to the report "Summary of Historical Adjustments to Crime Data for Ontario, 1977-2000".


    Richmond RCMP moved from the aggregate to the microdata UCR survey in 2003. A lack of functionality within their Record Management System to distinguish between established and un-established offences has affected Richmond's crime reporting. This is having the net effect of artificially inflating their crime rate and lowering their clearance rate.
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