Well they can track us by our cell phones if they want too, most of us keep the cell phone with us, so yes if they want to know where you are they can. We all know that the NSA is tapping phones and emails. Most of the new cars already have the system in it that they can actually track the car if they want too. They also have what is called a black box in them, just about any car with an airbag has one.They have been putting a code done by little yellow dots on every printer telling the serial number of the printer that a printed page came from and also what time it was printed. These little yellow dots are invisible to the naked eye but a magnifying glass or microscope and a blue light and they show up, align them with a correct grid of numbers, and you can find the serial number of the printer that was used.Also your camera when it takes a picture leaves a code on the imprinted picture that can be traced back to the camera that took it.These are some of the everyday objects we use that we know about that the government has used to spy on us, so one has to ask themselves what else is being used we don't know about. One thing that comes to mind for me is the tv or the DVD players we all have, while we live out our everyday lives in front of them, are they watching us?