Home 9 Get Help 9 Vehicle Stops Report 9 2016 VEHICLE STOPS EXECUTIVE SUMMARY


In 1780, in the midst of the Revolutionary War, John Adams took up his pen to help draft a new constitution for his home state. He famously wrote in that document’s opening lines that the aim of the American Revolution was to establish “a government of laws, not of men.” That has been the American ideal ever since. The rule of law is impartial. It is no respecter of persons. It restrains the violent and protects the weak. It is blind to all but conduct and character.

With this ideal in view, the Missouri General Assembly created the Annual Vehicle Stop Report nearly two decades ago. This Report was meant to further our common commitment as Missourians to the rule of law, and our common efforts to achieve it. When a person is stopped or searched or arrested only because of his race, the rule of law suffers. Racial profiling threatens that fairness and impartiality the rule of law demands. And it badly undermines the vital trust between everyday citizens and the law enforcement officers who risk their lives to protect them.

As it does each year, this year’s Report contains statistics and information about certain vehicle stops conducted over the last calendar year. I hope this data will help us toward a constructive conversation about what we must do together to better achieve—and protect—the rule of law in our state.

A final word about the data itself. For years, commentators have noted that the Report only compares the number of individuals from a particular racial or ethnic group involved in traffic stops to the number of persons in that group who live in the jurisdiction and are eligible to drive. A better and more informative approach would compare the frequency of stops involving particular groups to the number of group members who actually do drive in the jurisdiction, which in some cases may differ substantially from the number who live in the jurisdiction and are of driving age.

Consequently, I am issuing new regulations that will direct law enforcement agencies to collect information about whether stopped individuals reside within the agency’s jurisdiction. This change, fully supported by both law enforcement and the civil rights community, will enable the public to draw more relevant inferences from the traffic-stop data going forward.


Concerns by the citizens of Missouri and the Missouri legislature regarding allegations of racial profiling by law enforcement prompted the passage in 2000 of Section 590.650, RSMo. That statute requires that all peace officers report specific information—including a driver’s race—for each vehicle stop made in the State. Law-enforcement agencies must provide the data to the Attorney General by March 1, and the Attorney General is required to compile the data and report to the Governor no later than June 1 of each year. The Governor may withhold state funds for any agency that does not comply with these requirements.

The statewide vehicle-stop data contained in this Report have been analyzed by Dr. Scott H. Decker, professor and director of the School of Criminology and Criminal Justice at Arizona State University; Dr. Richard Rosenfeld, professor in the Department of Criminology and Criminal Justice at the University of Missouri-St. Louis; and Dr. Jeffrey Rojek, assistant professor in the Department of Criminology and Criminal Justice at the University of South Carolina.


Statewide Metrics Total White Black Hispanic Asian Am. Indian Other
Population 4,730,501 3,914,998 515,828 139,109 80,677 19,168 60,721
Stops 1,555,468 1,212,726 279,657 34,472 14,395 1,800 12,418
Searches 95,944 67,546 24,533 2,924 375 105 461
Arrests 72,390 50,730 18,443 2,455 286 78 398
State population % 100.00% 82.76 10.90 2.94 1.71 0.41 1.28
Disparity index – – – .94 1.65 .75 .54 .28 .62
Search rate 6.17 5.57 8.77 8.48 2.61 5.83 3.71
Contraband hit rate 32.32 33.89 29.02 25.31 25.60 26.67 30.59
Arrest rate 4.65 4.18 6.59 7.12 1.99 4.33 3.21
Notes: Population figures are 2010 census estimates for persons 16 and older who designated a single race. Hispanics may be of any race. Other includes persons of mixed race and unknown race.

Disparity index = (proportion of stops / proportion of population). A value of 1 represents no disparity; values greater than 1 indicate over-representation, values less than 1 indicate under-representation.

Search rate = (searches / stops) X 100.

Contraband hit rate = (searches with contraband found / total searches) X 100.

Arrest rate = (arrests / stops) X 100.


This report summarizes the data from 601 law enforcement agencies in Missouri for calendar year 2016. An additional 60 agencies indicated they made no traffic stops during the year. This represents 96.9% of the 682 law enforcement agencies in the State. The agencies filing reports recorded a total of 1,555,468 traffic stops, resulting in 95,944 searches and 72,390 arrests. Table 1 breaks out the stops, searches, and arrests by race and ethnic group.1 Table 1 includes four summary indicators that may be useful in initiating further assessments of racial profiling in traffic stops. Footnote 1

1. Disparity Index
The “disparity index” compares the percentage of traffic stops involving members of a certain group to the percentage of driving-age individuals who are members of that group, as measured by the 2010 Census. A disparity-index value of 1 indicates that a group’s proportion of traffic stops equals its population proportion. For example, if a group accounts for 80% of the driving-age population, and 80% of traffic stops involve members of that group, then the disparity index for that group would be 1. A disparity-index value of 1 indicates that members of a group are stopped at precisely the rate one would expect if all members of the driving-age public were equally likely to be involved in a traffic stop.

A disparity-index value above 1 indicates that a group accounts for a higher proportion of traffic stops than its percentage of the population alone would predict. And a disparity-index value below 1 indicates that a group accounts for a lower proportion of traffic stops than its percentage of the population alone would predict. For example, the 1,212,726 Whites who were stopped accounted for 78.0% of all traffic stops in 2016. Whites comprise an estimated 82.8% of Missouri’s driving age population. The disparity-index value for Whites is, therefore, .94 (i.e., .780/.828). Whites were stopped, in other words, at slightly below the rate expected based on their fraction of the driving-age population from the 2010 Census.

The same is not the case for several of the other groups. African-Americans represent 10.9% of the driving-age population but 18.0% of all traffic stops, for a disparity-index value of 1.65. African-Americans were stopped at a rate 65% greater than expected based solely on their proportion of the driving-age population. Hispanics, Asians, American Indians, and persons of mixed or unknown race were stopped at rates well below their proportion of the driving-age population. The values on the disparity index for the different groups can be compared directly to one another. For example, the rate at which African-American motorists were stopped is 1.75 times that of the rate at which White motorists were stopped (i.e., 1.65/.94). In other words, accounting for their respective proportions of Missouri’s driving-age population, African-Americans were stopped at a rate 75% higher than Whites. Importantly, the disparity index relies on a group’s proportion of the State’s driving-age population, as determined by the 2010 Census, not the proportion of the actual drivers who are on the State’s roads. A group’s share of the residential population age 16 and over may or may not equal its proportion of drivers. In many instances, particularly at the statewide level, the two proportions should be close. But that is not always the case. The extremely low disparity-index value for American Indians, for example, could indicate that they are under-represented among the State’s motorists. In addition, some jurisdictions contain attractions—such as malls, universities, and airports—that may draw visitors from outside that jurisdiction. The demographics of these out-of-jurisdiction visitors may differ from the Census demographics of the jurisdiction. The disparity index does not account for these and other deficiencies in the data. Where these deficiencies are especially pronounced, especially at the level of individual jurisdictions, the disparity index may not accurately portray the relevant rates at which drivers of different races are stopped.

2. Search Rate
The “search rate” reflects the percentage of stopped drivers whose person or vehicles were searched as part of the stop. Searches include searches of drivers or property in the vehicle. The reasons for conducting a search and the outcome of the search (i.e., discovery of contraband) should be considered when making comparisons across groups. Some searches are conducted with the consent of the driver, while others occur because the officer observed suspected contraband in plain view or had reasonable suspicion that an individual may possess a weapon (a “Terry search”). These searches may or may not result in an arrest. Other searches are conducted incident to arrest—that is, there is no other reason given for the search other than arrest. Searches are almost always performed when there is an outstanding arrest warrant, whether or not contraband may be present.

The search rate for all motorists who were stopped in 2016 was 6.17%. Asians were searched at a rate well below the statewide average; African-Americans and Hispanics were searched at rates above the average for all motorists who were stopped. The search rate for the different groups also can be compared directly with one another. African-Americans were 1.57 times more likely to be searched than whites (8.77/5.57). Hispanics were 1.52 times more likely than whites to be searched (8.48/5.57).

3. Contraband Hit Rate
The “contraband hit rate” reflects the percentage of searches in which contraband is found. Contraband was found in 32.3% of all searches that were conducted in 2016. There is some variation, however, in the contraband hit rate across race and ethnic groups. The contraband hit rate for whites was 33.9%, compared with 29.0% for Blacks and 25.3% for Hispanics. This means that on average searches of African-Americans and Hispanics are less likely than searches of Whites to result in the discovery of contraband. This difference may result in part from the higher arrest rates for African-Americans and Hispanics, circumstances that compel a search.

4. Arrest Rate
The “arrest rate” reflects the percentage of stopped drivers who are arrested during the stop. Approximately 4.65% of all traffic stops resulted in an arrest. The arrest rate varies across the race and ethnic groups. Approximately 6.6% of the stops of African-Americans and 7.1% of the stops of Hispanics resulted in arrest, compared with 4.2% of the stops of whites. African-Americans and Hispanics are searched more often than whites, but they are arrested more often as well.

This report includes two Appendices. Appendix A presents the traffic-stop analysis using the statewide proportions of race and ethnicity, rather than those for each jurisdiction. Appendix B compares each agency’s 2016 disparity index to the disparity index for 2000 through 2015.2 These comparisons are presented in Appendix B. For each agency, the disparity index for each race-ethnic group is presented for the years 2000-2016. For the State as a whole, the key indicators generally show small changes between 2015 and 2016. Footnote 2

A reasoned determination of the existence of racial profiling in a community requires a comprehensive evaluation of the full range of information compiled in the agency reports. This brief summary of selected indicators for the State as a whole is intended to stimulate those local evaluations and dialogue.

Table 2. Agencies that did not submit reports by March 1, 2017 as required by state law
Appleton City Police Department Camden Point Police Department Cleveland Police Department
Crystal Lakes Police Department Edina Police Department Freeman Police Department
Gordonville Police Department Kinloch Police Department Lake Lafayette Police Department
Lilbourn Police Department Lockwood Police Department Lowry City Police Department
Marquand Police Department Marston Police Department Morley Police Department
Odessa Police Department Parma Police Department St. Robert Police Department
Stewartsville Police Department Town of West Sullivan Police Department Vanduser Police Department
Table 3. Agencies that reported no stops (many contract out vehicle stops to other agencies)
Altenburg Police Department Armstrong Police Department Atlanta Police Department
Beverly Police Department Bland Police Department Bunceton Police Department
Bunker Police Department Callao Police Department Canalou Police Department
Charlack Police Department Clarksburg Police Department Clarkson Valley Police Department
Cool Valley Police Department Cooter Police Department Creighton Police Department
Dellwood Police Department Dudley Police Department Eminence Police Department
Emma Police Department Eolia Police Department Fairfax Police Department
Fisk Police Department Florissant Valley Police Department Gilman City Police Department
Grandin Police Department Hale Police Department Harrison County Sheriff’s Department
Hayti Heights Police Department Holt Police Department Hurley Police Department
Jackson County Drug Task Force Jennings Police Department Meramec College Police Department
Mineral Area College DPS Miramiguoa Police Department Missouri Department of Revenue
Mokane Police Department Norborne Police Department Norfolk Southern Railway Police Department
Norwood Police Department Pasadena Park Police Department Pine Lawn Police Department
Randolph Police Department Sheldon Police Department St. George Police Department
St. Louis City Park Rangers St. Louis Community College at Forest Park St. Peters Ranger Enforcement Division
Tallapoosa Police Department Terminal Railroad Association Three Rivers Community College
Walker Police Department Wellston Police Department Westwood Police Department
Wildwood Police Department Williamsville Police Department Windsor Police Department
Wyatt Police Department


Footnote 1: Hispanics may be of any race. About 1 percent of the population designated two or more races. These persons are included in the “other” category along with persons of unknown race.

Footnote 2: Caution should be used when comparing 2000 to subsequent years, especially for smaller agencies, because the 2000 figures are based on only four months of traffic data, while those for subsequent years are based on the full calendar year.