The ACLU has produced a detailed map laying out the complex patchwork of existing state law on cell phone tracking. Check it out.

Here in Massachusetts, police are required to obtain a warrant before demanding more than six hours of your historical cell site location information from your cell phone company. But while that’s a step in the right direction, it’s not good enough. Law enforcement should be required to get a warrant for even one piece of our location data. The Electronic Privacy Act, currently before the state legislature, would require that.