It must be accompanied by other measures. Earlier, I mentioned bracelets. From what I know about how an offender is monitored every two weeks, there isn't much to it. The person just signs a log, and that's it. There are no safety measures and no real follow-up. When a sexual predator strikes, in the first few days, they are still feeling the rush of adrenaline. There may be a way to obtain information at that point because they still have a sensitivity. But, two weeks later, they have accepted their crime, they have come to terms with it. They can be in a situation and remain calm. If the probation officer questions them about their recent comings and goings when the crime happened two weeks ago, it does absolutely no good.
On May 17th, 2012. See this statement in context.