The actual study in question is pretty limited - I don't have any problem with the data published to the PNAS report: https://www.pnas.org/doi/10.1073/pnas.2216

The actual study in question is pretty limited - I don't have any problem with the data published to the PNAS report: https://www.pnas.org/doi/10.1073/pnas.2216162120 https://www.pnas.org/doi/10.1073/pnas.2216162120 But the decision to limit the study exclusively based on race was a post facto decision that doesn't make a lot of sense given the context of what they were studying. Imagine if they published a study called "Escalated police stops of Right Handers are linguistically and psychologically distinct in their earliest moments" and then you found out that they left out the data on left handers, you would also be very suspicious. Malpractice might be a bit of a strong word, but I find it distinctively annoying when researchers intentionally play around with their sample sizes.