1. A computer-implemented method for vehicle or entity tracking, the method comprising: actively searching for one or more alerts in a geographic area instead of passively waiting for a broadcast; receiving a first set of data, said data comprising video or images from a first mobile data source in the geographic area; determining that said first set of data matches a second set of data in a first data source, the second set of data corresponding to a vehicle or entity being tracked, as indicated in the one or more alerts, and wherein the first data source is a registry of vehicles or entities to be tracked; requesting a third set of data, said data comprising video or images from a second mobile data source in the geographic area; and determining a confidence level based on how well said first and third data sets match said second data set.