Researchers Used Watered-Down Language, Removed Some Disturbing Findings in Study on Racial Profiling in San Diego Police Department: Report


In November, a long-awaited study about whether the San Diego Police Department engaged in racial profiling was released, with the not-surprising results that black and Hispanic motorists were more likely to be searched and more likely to be subject to field interviews, although they were less likely to have contraband items. However, a new report now indicates that researchers from San Diego State University who helped with the report softened their language a great deal while writing some of the results, and even removed some of the findings entirely.

According to the Voice of San Diego, when addressing the overarching question of whether officers and the Police Department as a whole showed racial bias, San Diego State researchers acknowledged that there were differences in the way minority motorists and white motorists were treated. But researchers also added that those differences “are by no means unique to the SDPD,” noting that the findings only “suggest” that implicit bias “may exist” among officers.

However, when the Voice of San Diego obtained draft copies of the study from San Diego State, the findings were, in fact, more pointed. According to the report, city officials had attempted to stop the drafts from being released publicly, saying that the disclosure “would likely increase community tension and discontent.” (Of course, any signs of a cover-up would not have had the same effect, I’m sure.)


In comparing the draft copy with the final version released to the City Council, the Voice of San Diego found that some of the harsher language had been softened and some findings were completely removed. The changes included the following:

In more than two-dozen instances, the word “bias” was replaced with “disparities.”

An early draft recommended the department stop making traffic stops for minor violations unrelated to public safety, and instead simply issue citations by mail—something, researchers noted, other departments are exploring.

Also cut from the final draft was the finding, via police survey, that the majority of officers felt they wouldn’t benefit from additional training in fair and impartial policing.

The final version of the study found that black drivers were more likely than white drivers to be stopped in only one of the San Diego Police Department’s nine divisions, northeastern, which includes the largely white neighborhoods of Mira Mesa, Rancho Bernardo, Rancho Peñasquitos and Scripps Ranch. A draft version reached a different conclusion, finding evidence of racial disparities in three divisions, not just one, and, in aggregate, all police divisions located north of Interstate 8, often considered to be San Diego’s racial and economic dividing line.

The Voice of San Diego notes that, regarding the last finding, the study’s lead researcher, Joshua Chanin, professor of public affairs at SDSU, said the change was made because researchers opted to use a different threshold to determine whether a finding was statistically significant. Initially, researchers considered a finding statistically significant if there was at least a 90 percent chance that it was true, but they later changed that threshold to 95 percent.

In the Northern Division of the Police Department, the likelihood that racial disparities in traffic stops weren’t just by chance was about 93.4 percent, while in the Southeastern Division it was 92.3 percent, and for all of the divisions located above the Interstate 8 divide, it was 94.2 percent.


A draft of the study provided to the city on Oct. 27 noted, “[O]ur analysis of combined stops from all five divisions above Interstate 8 shows that when compared to Whites, Black drivers are 15 percent more likely to be stopped during daylight hours, when driver race is visible, than after dark, when driver race is obscured.”

However, by the time the final draft rolled around, the finding read as follows: “Analysis of the aggregated data from [divisions north of I-8] shows no statistically significant difference in the daylight-darkness stop patterns of Black and White drivers.”


Chanin said that the intent was to provide a study in which the findings were “unassailable” by the city and the Police Department, and that the 95 percent threshold is considered a standard in scientific research, the Voice of San Diego notes.

He also stated that the research team thought that the edits were necessary in order to get the Police Department to take the study seriously. However, City Councilman David Alvarez told the site that he wished researchers had found a way to explain that some of the findings were almost within the threshold.


“It’s even more important when you’re dealing with the public who aren’t statisticians and who need to get a narrative and a description of what the findings were because that’s how you’re transparent about information,” the councilman said.

In an earlier draft of the study, researchers recommended that the Police Department cut back on using traffic stops for equipment violations such as broken brake lights or tinted windows, as a means of improving community relations and officer safety.


“We note that other police departments are currently in the process of reconsidering their approach to traffic stops in this way by directing officers to focus on the violations most related to safety, such as speeding and the running of red lights,” the draft noted.

Researchers also recommended that officers just record the car’s license plate number and suggested that the department implement a system to give the driver a warning or “fix-it” ticket through the mail.


However, the department turned up its nose at that recommendation, according to what Chanin told the Voice of San Diego, and then researchers were left with the choice of whether to keep a recommendation that would have been ignored or to cut it to “foster goodwill and enable some of the other [changes] that we felt were possibilities.”

Chanin claims that this was the only major change made in response to pressure from the city, adding that regardless of any changes made between versions, “there’s clear evidence in this report that there is a difference in the way that black and brown people are treated that whites.”


Read more at the Voice of San Diego.

News Editor at The Root, animation nerd, soca junkie, yogi

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Initially researchers considered a finding statistically significant if there was at least a 90 percent of it being true, but later changed that threshold to 95 percent.

In the Northern division of the police department, the likelihood that racial disparities in traffic stops weren’t just by chance was about 93.4 percent, while in the southeastern division it was 92.3 percent and for all of the divisions located above the I-8 divide it was 94.2 percent.

Ahh yes the old trick of changing statistical analysis AFTER the data has been collected. Up there with excluding data sets/points for contrived reasons because they didn’t fit the desired conclusion.