Jeff Jonas has published an important post: “Your Movements Speak for Themselves: Space-Time Travel Data is Analytic Super-Food!”
More than you probably realize, your mobile device is a digital sensor, creating records of your whereabouts and movements:
Mobile devices in America are generating something like 600 billion geo-spatially tagged transactions per day. Every call, text message, email and data transfer handled by your mobile device creates a transaction with your space-time coordinate (to roughly 60 meters accuracy if there are three cell towers in range), whether you have GPS or not. Got a Blackberry? Every few minutes, it sends a heartbeat, creating a transaction whether you are using the phone or not. If the device is GPS-enabled and you’re using a location-based service your location is accurate to somewhere between 10 and 30 meters. Using Wi-Fi? It is accurate below 10 meters.
The process of deploying this data to markedly improve our lives is underway. A friend of Jonas’ says that space-time travel data used to reveal traffic tie-ups shaves two to four hours off his commute each week. When it is put to full use, “the world we live in will fundamentally change. Organizations and citizens alike will operate with substantially more efficiency. There will be less carbon emissions, increased longevity, and fewer deaths.”
This progress is not without cost:
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Frankly, I don’t expect the scholars, lawyers, and judges who have been steeping in traditional Fourth Amendment doctrine their entire careers to get the thesis of my recent American University Law Review article. But you can! And, eventually, if I do enough work, they will.
Here are some highlights from the introduction to “Reforming Fourth Amendment Privacy Doctrine“:
Since 1967, the Supreme Court and lower courts have relied too heavily on an unreliable test that arose from the leading Fourth Amendment case, Katz v. United States. Distracted by Justice Harlan’s concurrence in the case and befuddled by the concept of “privacy,” courts have ignored the simple rule of the actual holding in Katz and conditioned Fourth Amendment rights on surmises about privacy “expectations.”
Privacy is a real thing that need not be a matter of conjecture. The
Katz Court held that personal information was protected by the Fourth Amendment because, as a factual matter, the defendant had kept it private. Installing a wiretap to overcome Katz’s use of law and physics to conceal information was unreasonable without a warrant. The Court did not base its holding on open-ended “expectations” or “reasonableness,” as Justice Harlan’s concurrence suggested, but on the affirmative steps Katz took to conceal that information.
. . .
If an individual has secured the privacy of particular information, the Fourth Amendment focuses on the reasonableness of the government’s actions in undoing that privacy, not on the reasonableness of the individual’s expectations.