It has been six months since Ahmaud Arbery, a young Black man, was shot by three white men while he was out for a Sunday jog near his childhood home. The video of the killing, taken by one of the men who participated in it, could be said to have kindled the blaze that ignited after the deaths of Breonna Taylor and George Floyd. 

There was no mystery to be solved in Arbery’s killing. It happened in broad daylight, and the men who did it were on the scene when police arrived. But the killers walked free, and no one was arrested for seventy-four days—until after the video was made public and caused a scandal. What, exactly, were prosecutors thinking? Caroline Lester spoke with Arbery’s mother, a local reporter, lawyers, and a district attorney to understand what happened in those seventy-four days. His case, she finds, highlights a fundamental problem for criminal-justice reform: we may change the laws that govern policing, but those laws have to be vigorously enforced. And district attorneys may have little incentive to do so.