Here is a working link, but it only shows the abstract unless you have access via your institution.
I read the article, and pretty much every comment in this thread is off the mark. First, the people (Jimmy and Underseer) dismissing the conclusions based upon contrary evidence from particular instances are engaging in fallacious reasoning that the research conclusions are assuming there are never instances where respectful blacks are killed or where disrespectful whites are killed.
There is no assumption that respect and race are the only two possible factors that lead to police shootings. If demeanor is a causal factor and race is not, there would still be such instances, it would just mean that their cause is something other than demeanor or race.
Every possible combination of race and demeanor can be and likely is found in both outcomes where officers use minimal force and use excessive force. So, pointing to such instances tells us nothing. The question is the relative prevalence of these combo of factors in both such outcomes and what the underlying cause is of any differences in prevalence. It is also worth noting that the article shows that physical "demeanor" (backing away, signaling likely flight, disobeying commands about physical movement) is even more important a factor in than verbal demeanor (being rude, yelling, name calling, etc.).
However, the article does not actually test what happens in any real world situations. Rather it is 2 artificial lab experiments that don't even attempt to simulate real world interactions. The cops were given written stories to read about hypothetical situations involving a series of different suspects. The person was always described as dressed in baggy jeans and a t-shirt and acting anxious, but they were either described as engaging in disobedient and disrespectful words or actions or being compliant and polite. They were also either said to be white or black.
Here is their scenario. Inside the brackets is different versions officers were given. There were 8 possible combinations of race, being verbally respectful, and being physically respectful.
[P]
"While on patrol, you receive a suspicious person call. You arrive at the scene and identify a suspect who fits the description you were given—a [white/black] male, in his 20s, wearing baggy jeans and a t-shirt. When you approach the suspect, he seems uneasy and anxious. When you first begin to question him, he [is compliant and respectful, and refers to you as sir or ma’am/refuses to tell you anything, and is disrespectful, loud, uses profanity, and calls you names/backs away and starts to walk off while you are still talking]."
[/P]
Then officers gave a 1 to 5 rating of how important they felt is was to engage in different behaviors tied to procedural justice (being courteous and respectful to suspect, explain why you stopped them, allow them to explain themselves, don't take action until all info is gathered.)
IOW, the situations has almost no similarity to real world interactions and it was made explicitly salient of officers that race was part of it. In real life, cops attend to race implicitly and the actions and words of the suspect are things they must observe and interpret for themselves rather than have some omniscient narrator tell them what info in the situation is important and how to interpret it. It is precisely in how and what info a cop processes about a situation and how the interpret it that is where any potential racial biases would come into play. Yet none of that situational processing is required in these studies.
All this study tells us is that if you sit cops in a room and ask then whether black people deserve less procedural justice simply for being black, then cops will say "No", but they will say that justice is less important if the suspect is disrespectful. Thus, cops realize they are not supposed to be overtly racist, but frighteningly do not realize it is their job to de-escalate situations and act like the more reasonable and calm person when they encounter suspects.
At very minimum, they should have had the cops view videos of the suspects where they still had to attend to and interpret the information rather than have select features of it narrated to them and interpreted for them. That still wouldn't solve the problem that the cops aren't engaging in honest reactions but merely reporting what they think others will view as acceptable reactions. Perhaps, one could record some physio measures like heart rate, muscle tension, skin conductance, etc.. that are tied to fear, anger, and threat perception.