A journalist explains the promises and failures of high-tech policing

On a reporting trip to Arizona to learn about the business of Tasers, Matt Stroud volunteered to have the technology tested on himself. “I didn’t know what to expect, and the short description is that it feels like being electrocuted over your entire body,” Stroud says. “You’re completely unable to move.” Stroud had two people on either side of him, and if it weren’t for them, he would have fallen to the ground.“That gave me a real appreciation fo