Default Stingray phone tracking systems

Local PD has started using this. And when the news asked why and what kind of information they are getting. They replied. "Ask the FBI"

This is 100% wrong and should be illegal.

But my question is. How can you block your phone from jumping onto their false tower?
samsung omnia i910>htc libra>htc tytn II>htc rhodium>samsung i760>htc eris>samsung fascinate>lg spectrum>samsung precedent>htc vivid>htc amaze