Earlier quoted context omitted.
It's one data point in a pretty large body of evidence; the FBI thinks they're infiltrating law enforcement in a widespread fashion. A fascinating study from Stanford looked at police traffic stops nationally around the daylight savings switch (as a natural experimental control) and found pretty hard evidence cops treat black drivers very differently during the day (i.e. when they can see their skin color). https://n…
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Because on the day time shifted an hour artificially due to daylight savings, the racial discrepancy moved by an hour, even though the sun physically didn't.
(The alternative explanation is that black people all decide collectively to drive worse/better when daylight savings changes twice a year. Which seems... unlikely.)
It's an extremely clever approach. I'd encourage you to at least skim the article rather than asking questions it readily answers.