Racial Bias in Motor Vehicle Searches: Additional Theory and Evidence
Knowles, Persico, and Todd (2001) develop a model of police search and offender behavior. Their model implies that if police are unprejudiced the rate of guilt should not vary across groups. Using data from Interstate 95 in Maryland, they find equal guilt rates for African-Americans and whites and conclude that the data is not consistent with racial prejudice against African-Americans. This paper generalizes the model of Knowles, Persico, and Todd by accounting for the fact that potential offenders are frequently not observed by the police and by including two different levels of offense severity. The paper shows that for African-American males the data is consistent with prejudice against African-American males, no prejudice, and reverse discrimination depending on the form of equilibria that exists in the economy. Additional analyses based on stratification by type of vehicle and time of day were conducted, but did not shed any light on the form of equilibria that best represents the situation in Maryland during the sample period.
|Date of creation:||Apr 2003|
|Date of revision:||Dec 2003|
|Note:||Acknowledgments: We would like to thank John Knowles and the Maryland ACLU for kindly providing the data.|
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- John Knowles & Nicola Persico & Petra Todd, "undated".
""Racial Bias in Motor Vehicle Searches: Theory and Evidence'',"
CARESS Working Papres
99-06, University of Pennsylvania Center for Analytic Research and Economics in the Social Sciences.
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