In Monday night’s debate, Donald Trump reiterated his call for “law and order” in America. “We need law and order. If we don’t have it,” the Republican candidate said, darkly, “we’re not going to have a country.” His most concrete suggestion in this vein has been to call for more robust stop-and-frisk policing – specifically in Chicago, which is mired in a year of unusually high violent crime. Chicago actually already has stop-and-frisk policing, which makes Trump’s policy prescription a little confusing.