You Are a Rogue Device

If you're walking around downtown Seattle, look up: You'll see off-white boxes, each one about a foot tall with vertical antennae, attached to utility poles. If you're walking around downtown while looking at a smartphone, you will probably see at least one—and more likely two or three—Wi-Fi networks named after intersections: "4th&Seneca," "4th&Union," "4th&University," and so on. That is how you can see the Seattle Police Department's new wireless mesh network, bought from a California-based company called Aruba Networks, whose clients include the Department of Defense, school districts in Canada, oil-mining interests in China, and telecommunications companies in Saudi Arabia.

The question is: How well can this mesh network see you?

How accurately can it geo-locate and track the movements of your phone, laptop, or any other wireless device by its MAC address (its "media access control address"—nothing to do with Macintosh—which is analogous to a device's thumbprint)? Can the network send that information to a database, allowing the SPD to reconstruct who was where at any given time, on any given day, without a warrant? Can the network see you now?...


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