As far as additional personnel, really, what you'd be dealing with in Canada is people being released on a probation order or recognizance. I think it's the same in the United States; you may use different terminologies. So the probation officers, if they did not have a GPS or a monitoring device, would have no idea other than the word of a witness saying that the accused or the person charged is not in his or her residence. Tell me if I'm correct or not.
On May 15th, 2012. See this statement in context.