“Grits has spent a fair amount of the last year thinking about Fordham law prof John Pfaff’s theories on mass incarceration – first in a couple of law review articles he wrote, then on his Twitter feed, and finally in his recently published book: Locked In: The True Causes of Mass Incarceration and How to Achieve Real Reform. I’ve written before that his data observations hold true for Texas, almost puzzlingly so, but his recommendations to me never seemed quite right. After reading the book-length exposition of his ideas, I now can say why.”