There are really two questions here, which should be tested separately: (1) Is the software significantly predictive? Test the software's predictions against a

There are really two questions here, which should be tested separately: (1) Is the software significantly predictive? Test the software's predictions against actual crime in areas with no patrols. (2) Are patrols effective deterrents to crime? Observe the area in question with and without patrols. (I wouldn't be surprised to learn there are already such studies.) If both (1) and (2) yield positive results, you can then use the software to direct patrols and see if the method itself is effective at reducing crime; which would also serve to further confirm (2). Of course, even if only (1) yields positive results, there would probably be other benefits to using the software to direct patrols, like reducing response times (which could also be tested).