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The chart shows that White drivers are stopped at rates slightly higherthan the percentage of <br />Whites in the city population andlower than the percentage of Whites in the county population. <br />Blackdrivers are stopped at rates higher than the percentage of Blacks found in the cityand county <br />populations. Hispanic driversare stopped at rates lower than the percentage of Hispanics found <br />in the city and county populations. <br />Methodological Issues <br />Upon examination of the data, itis important to notethat differences in overall stop rates of a <br />particular racial or ethnic group,compared to that racial or ethnic group’s proportion of the <br />population, cannot be used to make determinationsthat officers have or have not racially profiled <br />any given individual motorist. Claims asserting racial profiling of an individual motorist from the <br />aggregate data utilized in this report are erroneous. <br />For example, concludingthat a particular driver of a specific race/ethnicity was racially profiled <br />simply because members of that particular racial/ethnicgroup as a whole were stopped at a higher <br />rate than their proportion of the population—are as erroneous as claims that a particular driver of <br />a specific race/ethnicity could NOT have been racially profiled simply because the percentage of <br />stops among members of a particularracial/ethnic group as a wholewere stopped at a lower <br />frequency than that group’s proportion of the particular population base (e.g., city or county <br />population). In short, aggregate data as required by law and presented in this report cannot be used <br />to prove or disprove that a member of a particular racial/ethnic group was racially profiled. Next, <br />we discuss the reasons why using aggregate data—as currently required by the state racial profiling <br />law—are inappropriate to use in making claims that any individual motorist was racially profiled. <br />Issue #1: Using Group-Level Data to Explain Individual Officer Decisions <br />The law dictates that police agencies compile aggregate-level data regarding the ratesat which <br />agencies collectivelystop motorists in terms of their race/ethnicity. These aggregated data are to <br />be subsequently analyzed in order to determine whether or not individualofficers are “racially <br />profiling" motorists. This methodological error, commonly referred to as the "ecological fallacy," <br />defines the dangers involved in making assertions about individual officer decisions based on the <br />examination of aggregate stop data. In short, one cannot provethat an individualofficer has <br />racially profiled any individualmotorist based on the rate at which a department stops any <br />given groupof motorists. In sum, aggregate level data cannot be used to assess individual officer <br />decisions, but the state racial profiling law requires this assessment. <br />Issue #2: Problems Associated with Population Base-Rates <br />There has been considerable debate as to what the most appropriate population “base-rate” is in <br />determining whether or not racial/ethnic disparities exist. The base-rate serves as the benchmark <br />for comparison purposes. The outcome of analyses designed todetermine whether or not <br />disparities exist is dependent onwhich base-rate is used. While this report utilized the most recent <br />2019 American Community Survey (ACS) as a population base-rate, this population measure can <br />become quickly outdated, can be inaccurate,and may not keep pace with changes experienced in <br />city and county population measures. <br /> <br />