On Wednesday, amid continued protests demanding “Justice for Michael Brown” prosecutors will bring evidence before a grand jury as they determine whether to indict Brown’s killer, Officer Darren Wilson. The power to indict rests with local prosecutors and pliant grand juries, and as Jonathan Cohn has pointed out, a prosecutor will usually refrain from indicting altogether if the accused faces a low likelihood of conviction. In this case, a combination of entrenched racial and occupational biases, and most importantly the oddities of Missouri law, all but ensures that a conviction is off the table. We may never know what actually...