For close to 20 years now, I’ve been observing and reporting on a disturbing trend in law enforcement – the federalization and militarization of local police forces. Until recently, practically no one noticed what was happening. But with the focus on police shootings and the civil disturbances that have followed – sometimes involving tanks, military-style gear and Kevlar – it’s hard not to notice that local cops don’t exactly look like Officer Joe Bolton anymore. It was none other than Al Sharpton (I won’t call him reverend) who suggested recently that the answer to the use of excessive force by...