'Hello? Who's There?'

The December issue of reason magazine has an interesting article about how the government can use our cell phones to track us and listen to conversations, most often legally and without a warrant. I can't find that article online yet, but I did find this one, about a device the LAPD and a few other police departments use. As explained in this article, "when LAPD fires up a StingRay, it's often the most powerful signal in the area. Instantly, the department's spy equipment becomes the go-to 'tower' for every cellphone and mobile device nearby — not just the phone carried by the suspect they're tracking": http://www.laweekly.com/2012-09-13/news/LAPD-stingray-spying-cellphone/