NEWYou can now listen to Fox News articles! Dublin, Ohio, gave a robot cop a trial run inside a public parking garage. Less than a year later, the machine was off the job and headed back to its maker.DubBot, a Knightscope security robot used by the Dublin Police Department, was meant to help deter crime, support emergency response and give the city another way to monitor a busy public space. However, its patrols led to zero arrests, tickets or criminal cases.Now the failed pilot raises a bigger question nationwide. Should local leaders have to prove these machines work before putting...