Major Victory for Privacy – Supreme Court Extends Constitutional Protection to Location History

Justice Kagan: “The Point of Carrying Smartphones Is What Is on Them”

​When your daily movements are tracked by your cellphone, you likely have an intuitive sense that this is your private information, even if it is shared with Google or Apple.
 
The Supreme Court made that common perception a principle on Monday.
 
In a 6-3 decision in Chatrie v. United States, the Court ruled that you do, indeed, have an expectation of privacy against government intrusion as your mobile devices track your movements throughout the day.
 
Based on a Solid Precedent
 
Monday’s ruling strengthens and extends a principle established by the Court in Carpenter v. United States (2018), which found that law enforcement needs a probable cause warrant to obtain cellphone users’ daily movements from cell towers.
 
In Chatrie, in which police conducted a broad search of many people’s location histories in order to catch a bank robber, the Court is now setting a broad principle that promises to extend to cases regarding other forms of data held by companies in the cloud.
 
The Court found that Google’s Location History “resembles other private materials – think of emails, documents, photographs, or calendars – that even if stored on Google’s servers, a user reasonably views as his own. And as a result, that he reasonably expects to be shielded from the ‘inquisitive eyes’ of the government.”
 
How We Got Here
 
The Court had to weigh the implications of Carpenter against the Fourth Circuit’s finding that the defendant “did not have a reasonable expectation of privacy in two hours’ worth of Location History data voluntarily exposed to Google.”
The majority opinion declared that the comparisons between Location History and cell-site tracking “practically leap off the page.” Cell-site tracking places an individual within one-eighth to four square miles. Google’s Location History placed Chatrie within twenty meters. In addition to this data’s precision, the Court noted the government can retrospectively construct the movements of cellphone users, effectively placing them under surveillance before they can even think of committing a crime.
 
Monday’s majority opinion reiterated the Court’s observation that modern cell phones are “such a pervasive and insistent part of daily life that the proverbial visitor from Mars might conclude they were an important feature of human anatomy.”
 
Justice Kagan’s Majority Opinion
 
Overall, the government contended that cellphone users voluntarily relinquish their data, that constitutional concerns should be applied on an app-by-app basis, and that the search was too brief to be constitutionally significant.
 
Justice Elena Kagan penned the majority opinion, which bitingly dissected each of the government’s arguments, starting with the assertion that our data sharing is voluntary. Justice Kagan noted that Google repeatedly prompts users to enable Location History. She wrote:
“The first prompt comes when a user initially establishes a Google account. If that spur is ignored, another will arrive when a user sets up a Google app – like Google Assistant, Google Maps, or Google Photos – on his phone or other device. Android (though not iPhone) users are specifically warned that their devices will not ‘work correctly’ unless they turn on Location History.”
 
What about the government’s claim that law enforcement accessing Location History should receive a Fourth Amendment “grace period” of some number of hours? Justice Kagan sardonically referred to this short grace period of a few hours as a “Constitution-free zone.”
 
At risk, she wrote, were “trips that a person is apt to think ‘indisputably private’ to the psychiatrist, the plastic surgeon, the abortion clinic, the AIDS treatment center … or the criminal defense attorney.”
 
Justice Kagan’s analysis tracked PPSA’s amicus brief, in which we held that “where the Fourth Amendment applies, it applies regardless of ‘the quality or quantity of information’ the government obtains.”
 
Justice Kagan also turned to how cellphone technology is actually used today to demolish the government’s idea of analyzing the constitutional implications of a search feature by digital feature. She wrote:
 
“The Government’s app-by-app, feature-by-feature method of granting Fourth Amendment protection misapprehends the very nature of modern cell-phone use. Pretty much everything a person does on a smartphone requires some kind of opt-in – an ‘affirmative act’ beyond ‘powering up’ to utilize a given app or service.”
 
Justice Kagan added:
 
“The Government wishes to disconnect all those [private] uses from the mere act of carrying a turned-on cell phone … with only the latter receiving assured Fourth Amendment protection. But that is to imagine that all of us are living in dumb flip-phone days. The point of carrying smartphones is what is on them” (emphasis added).
 
In its conclusion, the Court’s opinion harked back to Carpenter to define the access of historical location information, whether from a cell tower or Google’s Location History, as a search.
 
Monday’s ruling, however, does not fully resolve this case. The Supreme Court is sending the case back to the Fourth Circuit to define the probable cause requirements for every stage of the warrant process and to determine what the proper scope of the search should be.
 
Still, this is a monumental victory for privacy. Until now, as PPSA emphasized in our amicus brief, Carpenter has been treated by law enforcement as a narrow ruling that did not extend beyond location histories extracted from cell towers. Today’s ruling makes it clear that the Supreme Court intends to apply these Fourth Amendment principles across the digital landscape.

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