Predictive policing system to deter crimes before it happen

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As the title indicated, it sounds like one of Tom Cruise's movie, in the future we were be able to predict the crimes, and deter it before it actually happen. In reality, we do have such system, but it is run by the computer and sophisticated data center to predict the repetitive crimes in certain areas. For instance, in some area within LA, the robbery can be happen over and over again, with the help of this computer system, the central department can dispatch patrol cars around the area to look around. According to the system, most of the time, the repetitive crime might happen again, such as burglary. But there is one catch, such predictive policing system might violate the Fourth Amendment of our constitution rights. For example, if the police see someone suspicious because he was carrying a duffel bag around the crime areas, the police might ordered to stop that particular person for investigation. In court, you can't tell the judge this policeman have to stop a suspect simply the computer told him to do so. So, there is still need on improvement on it. I assume with this predictive policing system, it can really helps to deter some crimes to happen over and over again.