I see the future of RDs like this: GPS companies make their own RDs (by buying Belscort/MV/Whistler), which connects to a GPS unit via a cord (or wireless eventually). All of this information is shared with other drivers that use the same system. Areas with LEO activity in the last hour, as well as common speedtraps are indicated on the GPS map (although differently).
The RD would be able to filter out all falses because the GPS unit would share actual false frequency info. An integrated bogey counter would assure that a LEO wasn't sitting under the false source using the same frequency.