TRAFFIC STOPS

TRAFFIC STOPS BY RACIAL GROUP

What does this show?

Each bar on the right shows the percentage of the total stops recorded each year that were people of one racial group. The bars to the left, and the dotted line, show the average percentage of stops recorded for each racial group for the entire report period. Hovering over a bar shows the number of stops that makes up that percentage.

How was this calculated?

We took the average number of stops recorded per year and calculated the percentage of stops that were made of people of each racial group. See the Data Notes tab for information on how we define racial groups.

We measure a vehicle stop as a single record of a driver being stopped by police, regardless of the number of officers or passengers involved. We recognize that departments may collect vehicle stop data in other ways (for example, not distinguishing between searches of drivers and passengers). Our guidance on collecting data has more information on how to effectively report vehicle stops.

We generally use all vehicle stops data provided by departments, including incomplete years of data. However, certain analyses require complete years of data, so time periods may vary across charts.

Data required for this analysis:

To arrive at this finding, we first looked at the total number of traffic stops made in each quarter with complete data.

CONTRABAND FOUND AND NOT FOUND IN TRAFFIC STOP SEARCHES

What does this show?

One common explanation for why members of some racial groups are stopped or searched at different rates is that they may be more likely to have contraband. To assess this, we looked at whether searches of people of different racial groups resulted in contraband being found at different rates. For each racial group, we separated all searches into the percentage that resulted in contraband found and the percentage that resulted in no contraband found.

The darker portion of each bar (on the bottom) shows the percentage of all searches of people of that racial group that ended with contraband found, while the lighter portion of the bar (at the top) shows the percentage where no contraband was found. Hovering over a bar shows the number of searches that makes up that percentage. Each bar at the top shows the total number of searches recorded for that racial group.

It is important to compare this chart to the percentage of traffic stops of each racial group, above, to identify which groups may be experiencing a high volume of stops that may lead to high totals of contraband found. It’s also important to note that discovered contraband is not necessarily indicative of serious crime. It’s rare that contraband of any kind is found during a search, and an even smaller fraction of discovered contraband is related to serious criminal activity. Many instances of discovered contraband are simple drug possession, gun registration issues, or open containers of alcohol. While more substantial discoveries do occur, they come at the expense of thousands of stops that yield nothing; contraband searches are fundamentally unproductive and do not prevent serious crime. As such, police are considering more cost-effective strategies to prevent and respond to impaired driving, as well as address other issues like gun violence that more directly implicate public safety.

How was this calculated?

We took the total recorded searches of drivers of each racial group and calculated the percentage that did and did not reveal contraband.

Police are typically required to search people they arrest and vehicles they impound or tow. When the search reason is provided in the law enforcement agency’s data, these mandatory searches are excluded from this analysis because they are not necessarily based on an officer’s discretionary evaluation of whether they expect to find contraband. Otherwise, this analysis includes any search that was not recorded as mandatory, including both discretionary searches and those with no search reason provided.

See the Data Notes tab for information on how we define racial groups.

Data required for this analysis:

COMPARING SEARCH RATES AT TRAFFIC STOPS

What does this show?

This visualization shows, out of the same number of stopped drivers, how many drivers in each racial group were then searched.

How was this calculated?

We first divided the number of stops that involved a search for each racial group by the number of stops of that racial group. We then multiplied that number by 1,000 to get the per 1,000 stops rate.

Police are typically required to search people they arrest and vehicles they impound or tow. When the search reason is provided in the law enforcement agency’s data, these mandatory searches are excluded from this analysis because they are not necessarily based on an officer’s discretionary evaluation of whether they expect to find contraband. Otherwise, this analysis includes any search that was not recorded as mandatory, including both discretionary searches and those with no search reason provided.

See the Data Notes tab for information on how we define racial groups.

Data required for this analysis:

TRAFFIC STOP REASONS BY RACIAL GROUP

What does this show?

Each colored bar shows the percentage of all stops of drivers of that racial group for which that stop reason was recorded. Hovering over a colored bar shows the number of stops that make up that percentage. Each gray bar on the right shows the total number of stops that were made for a given reason. Any stop reason that was recorded in a high number of stops, or that has large disparities, will influence the racial makeup of vehicle stops overall.

The most common reason for contact with the police in the United States is being the driver in a traffic stop, and Black people are more likely to be stopped by police. Black people may also be more likely to be stopped for reasons that tend to be less related to public safety –such as equipment stops and license or registration checks– which unnecessarily increases their likelihood of being searched, experiencing police use of force, and being killed by police. Jurisdictions should invest in evidence-informed practices that reduce the footprint of policing on traffic safety to address persistent racial disparities in traffic enforcement that pose an ongoing public safety risk to Black people.

How was this calculated?

We took the total recorded stops of drivers of each racial group and calculated the percentage made for each reason. We then grouped these percentages according to stop reason.

We combine categories of reasons for easier interpretation. See the Data Notes tab for details on how these categories are created and how racial groups are defined.

Data required for this analysis:

TRAFFIC STOP OUTCOMES BY RACIAL GROUP

What does this show?

Each colored bar shows the percentage of all stops of drivers of that racial group for which that stop outcome was recorded. Hovering over a bar shows the number of stops that makes up that percentage. Each gray bar shows the total number of stops for which that stop outcome was recorded.

Findings on recorded traffic stop outcomes should be interpreted in context with findings on racial disparities in recorded stop reasons and searches at traffic stops. People of racial groups who are stopped more frequently are often also more likely to be stopped for reasons that tend to be less related to public safety, which may increase their likelihood of being released with a warning or no action taken, as well as decrease their likelihood of receiving a citation. People who are more likely to be stopped despite not committing any crime or infraction are subject to a greater burden of police contact, which increases the likelihood of a cascade of interrelated harms including arrest, criminalization, and even injury or death.

How was this calculated?

We took the total recorded stops of drivers in each racial group and calculated the percentages for which each enforcement outcome was recorded. We then grouped these percentages according to enforcement outcome.

We combine categories of outcomes for easier interpretation. See the Data Notes tab for details on how these categories are created and how racial groups are defined.

Data required for this analysis:

TRAFFIC STOPS BY WORK UNIT AND RACIAL GROUP

What does this show?

“Work unit” describes the work groups within a department. It can refer to the assignment of the officer making the stop (e.g. Detective Unit, Narcotics, Traffic, etc.), or the geographic areas where stops are made (i.e. precincts, districts, zones, etc.).

Each colored bar shows the percentage of stops recorded by each work unit of drivers of each racial group. The Multiple Work Units category, if used, represents stops involving officers from two or more work units. Hovering over a bar shows the number of stops that make up that percentage. The grey bars on the right show the total number of stops recorded by each work unit. Any work unit that records a large number of stops or records large racial disparities will influence overall racial disparities in vehicle searches. If disparities are present among most work units, or are severe in some work units, the different racial makeup of various neighborhoods is likely not the whole explanation for the observed disparity.

How was this calculated?

We took the total recorded stops and first separated them by the work unit that made the stop. We then calculated what percentage was recorded for people of each racial group.

The “Other Work Units” category, if used, combines the work units recording less than 2% of stops. See the Data Notes tab for information on how we define racial groups.

Data required for this analysis:

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