According to FBI Uniform Crime Reports, there were 425 gangland killings from 2000 to 2004, 0.6% of all murders committed in the United States during that time.
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This interest has surfaced most publicly in his critique of John Lott’s More Guns, Less Crime (see "A Note on the Use of County-Level Crime Data" and "Measurement and Other Errors in County-Level UCR Data: A reply to Lott and Whitley" below) based primarily on a detailed analysis of the validity of the Uniform Crime Reports data set that Lott used to draw his conclusions.
The core of the application includes the National Incident Based Reporting System (NIBRS) module which is designed to replace Uniform Crime Reporting (UCR) and strictly adheres to the reporting standards of the federal government and the Oklahoma State Bureau of Investigation (OSBI).