This could be a useful teaching tool for an undergrad metrics course.

Remember the Freyer paper? Heckman & Durlauf have written a comment (easy to read & non-technical all things considered) explaining why it doesn't show what the headlines say it does.
https://www.journals.uchicago.edu/doi/pdfplus/10.1086/710976
Specifically for teaching: the point they make is that there important selection bias from an implicit restriction on endogenous variables (stops), & reliance upon police self-reporting to determine whether the shooting was legitimate. Common problems to be aware of in data work.
Fryer's response to the comment, which I was unaware of.
Incorporating the comment & response into a homework assignment would be illuminating.
Students are accustomed to having "correct" answers, both sides having valid points is a good exercise. https://twitter.com/antoniomele101/status/1287693094121607169?s=19
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