​The U.S. Supreme Court will soon have a chance to reverse the dangerous precedent set by the Montana Supreme Court in Case v. Montana, which held that officers may enter a home based on mere suspicion of an emergency – instead of the stricter probable cause standard. Unless this Montana decision is reversed, the “community caretaker” welfare-check doctrine will be revived, gutting the Fourth Amendment’s protection of the home from warrantless intrusion.
 
The outcome of this case is far from certain, with U.S. Solicitor General John Sauer now urging the Supreme Court to sustain Montana’s lower standard.
 
A Step Backward
Here are the facts of this case: In 2021, Montana police responded after William Trevor Case’s ex-girlfriend reported suicidal threats and a “clicking” sound on their call. Officers forcibly entered Case’s home, discovered a firearm, and used that evidence to convict him of assaulting an officer.
 
The Montana Supreme Court refused to recognize a Fourth Amendment violation that would have suppressed this evidence. The court explained that “requiring probable cause of a criminal violation would make no sense in the context of emergencies ‘wholly divorced from a criminal investigation.’”
 
This reasoning is dangerous. It equates a home entry to a stop-or-frisk standard fit for automobile or street encounters. This ignores Supreme Court precedent, which has consistently held stricter protections for homes.
The decision invites pretextual entries into homes under the guise of “help.”
 
Worse, Montana revived the “community caretaker” justification. If upheld, this would undermine the Supreme Court’s holding in Caniglia v. Strom (2021), which rejects the idea that general “caretaking” justifies warrantless home entries.
 
The Government’s Hollow Case
The Solicitor General’s brief argues that the Fourth Amendment’s “reasonableness” standard, not probable cause, should govern such entries, because the Constitution confines probable cause to warrants.
 
Under this circular reasoning, discarding probable cause is proof enough that a warrant isn’t needed.
 
Yet the Fourth Amendment does not permit the probable cause standard to evaporate when someone invokes an “emergency.” To permit lower thresholds is to allow a backdoor into the home whenever officers claim they reasonably believe danger exists – a recipe for arbitrary and after-the-fact justification.
 
The same logic threatens to bleed into digital surveillance contexts. PPSA has long warned that if the home, the most sacred zone of privacy, can be entered on less-than-probable-cause grounds, then electronic devices (which contain privacies at least as intimate as a home) will be vulnerable to similar intrusion. Sauer’s brief would turn the Fourth Amendment into a permission slip.
 
The Court Should Hold Firm
Given the Montana court’s flawed approach and the Solicitor General’s weak argument, the Supreme Court should reverse and remand with instructions to suppress the evidence.
 
The privacy of the American home is too important to allow police to invade homes based on nothing but speculation.

In June, the U.S. Supreme Court granted the petition to hear Case v. Montana after PPSA filed the only brief supporting the Court’s review of a decision of the Montana Supreme Court.

PPSA has now filed its brief on the merits of the dispute. We made it clear that Case v. Montana is a precious opportunity to restore the Framers’ original vision of sharp limits on exceptions to the Fourth Amendment. The Framers jealously guarded privacy. Exceptions to the warrant requirement – exigent circumstances like chasing a bank robber into his home – had to be so pressing (and so obvious) that not granting them would be unreasonable. 

We've since veered off course. A new doctrine introduced in the mid-20th century, “emergency aid,” has threatened to grow into a catch-all category, a Trojan Horse by which the Fourth Amendment is thoroughly subverted. The temptation for law enforcement (and the courts) to treat everything as an “emergency” has never been greater than in this always connected, instant gratification digital age. 

We therefore ask the Court to remind our institutions to take two deep breaths before brushing aside the Fourth Amendment. We told the Court:

1. “The exception does not apply unless the entry is reasonably expected to alleviate, rather than worsen” the emergency. It is all too easy to say, as the State of Montana and the lower courts did in Case, that the police were just doing their job because they were “there to help.” Under that banner, all manner of constitutional violations could be forgiven. Yet the act of entering someone's home without a warrant was anathema to the Framers.
   ​
2. For the Founders, a “home” was the most sacred – and hence the most protected – place in a person’s life. If the Fourth Amendment condones a violation of that sacred, private space, then it also would logically condone a violation of less protected spaces, such as our digital devices. As we told the Court, “If the police do not violate the Fourth Amendment when they search a home or a phone while acting under a valid warrant exception, then anything incriminating they see in that capacity may be used against a person in a criminal prosecution.”

Then as now, exigencies that permit warrantless searches of persons, homes, and property must be defined narrowly, specifically, and in ways that preserve the Court’s respect for what it has called the “privacies of life.” 

Lowering the standard for warrantless “home” entry lowers it for everything. Just because our effects are vastly more digital (and diffuse) today, we have no less a right to be secure in our personal effects and our very lives.
​
We all know how Troy fell. It is time for the Court to take a good look inside the doctrine of exceptions to the Constitution.

​The U.S. First Circuit Court of Appeals in 2024 held that the IRS did not violate the Fourth Amendment when it scooped up the financial records of one James Harper through a broad dragnet of the Coinbase cryptocurrency exchange. The court based this finding on a sweeping interpretation of the “third-party doctrine,” which “stems from the notion that an individual has a reduced expectation of privacy in information knowingly shared with another.”
 
Given the terabytes of personal data that technology forces us to hand over to third-party companies, including our most intimate data – personal communications, online searches, health issues, and yes, financial holdings – does this mean that, as the First Circuit and other lower courts have ruled, there is essentially “no legitimate expectation of privacy” in that data?
 
Consider that the U.S. Supreme Court has repeatedly held that the Fourth Amendment protects “that degree of privacy against government that existed when [it] was adopted.” Times change and technology evolves. Any inquiry into reasonableness should require a periodic recontextualizing of what the Founders intended. That’s not anti-originalism; it’s just a common-sense application of original intent with new technology and capabilities.
 
The Supreme Court did just that in Carpenter v. United States, holding that the warrantless seizure of cell phone records constitutes a Fourth Amendment violation. In this case, at least, the high Court held that a reasonable expectation of privacy exists even when information is held by a third party.
 
As the Court wrote, “when an individual ‘seeks to preserve something as private,’ and his expectation of privacy is ‘one that society is prepared to recognize as reasonable,’ official intrusion into that sphere generally qualifies as a search and requires a warrant supported by probable cause.”
 
That goes not only for cell phone records but for any data that is supposed to be private.
 
In our brief that PPSA filed with the Court, we explain that:
 
“Despite Carpenter’s clear warning against allowing the third-party doctrine to degrade privacy via a ‘mechanical interpretation of the Fourth Amendment’ … lower courts have generally failed to heed that warning. Rather, they mechanically first ask if the information was disclosed to a third party and then treat this disclosure as a complete carveout from Fourth Amendment protections unless the circumstances closely or identically match Carpenter’s narrow facts.”
 
In this era of breakneck technological change and cloud computing, much of our personal information is disclosed to third parties – even information of the most sensitive kind. An interpretation that third-party disclosure automatically nullifies your right to privacy is a flawed approach in the 21st century. 
 
As we demonstrated in our brief, the Supreme Court must act to “prevent a contrary understanding of Carpenter from continuing to erode Americans’ privacy as third-party storage becomes ubiquitous and artificial intelligence becomes powerful enough to piece together intimate information from seemingly innocuous details about a target’s life.”  
 
Technology is evolving too robustly and too rapidly for the third-party doctrine to remain stuck in the era of paper bills. The First Circuit’s extreme interpretation of the third-party doctrine is a quaint vestige of a prior age, no longer equal to technologies that the Supreme Court ruled contain all “the privacies of life,” and it would make the Fourth Amendment a mere piece of ink on parchment rather than a true safeguard of Founding-era levels of privacy.

​“The poorest man may, in his cottage, bid defiance to all the forces of the Crown. It may be frail; its roof may shake; the wind may blow through it; the storm may enter; the rain may enter; but the King of England may not enter …”
                                                                        William Pitt the Elder, 1763
 
The U.S. Supreme Court in 2021 reaffirmed the sanctity of the home in Caniglia v. Strom, restricting warrantless entry into a home for “community caretaking” in order to conduct a wellness check on an American in his or her home.
 
Despite this clear precedent, the Supreme Court of Montana allowed warrantless entry into William Case’s home under the “community caretaker” exception supported by a wildly lenient standard that merely requires “specific and articulable facts.” (In this instance, Case v. Montana, Case’s ex-girlfriend reported to police that she thought Case might be suicidal.) On Monday evening, PPSA filed a brief asking the U.S. Supreme Court to review Montana’s decision and preserve the Caniglia standard.
 
The creeping expansion of the “community caretaking” exception extends far beyond the law. Common law has long held that officers could enter a home without a warrant only to apprehend a fleeing felon, or if police witnessed a fight or other event that could lead to imminent harm. There is no law from the Founding-era that would have allowed the police to enter a person’s home without a warrant for “community-caretaking.”
 
PPSA told the Supreme Court:
 
“Another powerful reason to grant review is the diluting effect such a low bar for emergency aid searches would cause in other contexts – especially regarding electronic devices … It seems inevitable that lowering the burden for warrantless home invasion would lower the burdens for warrantless invasion of all other repositories or private information.”
 
If the Montana Supreme Court’s ruling holds, this camel’s nose of community caretaking will threaten to admit not just the whole camel but other strange beasts. What is at stake is ultimately not just the long-held “castle and fortress” view of home privacy that traces back to English common law. It is also that an entry into a home will naturally lead to the next logical step – to “check-in” on someone’s well-being by breaking into the contents of their smartphone or other electronic devices.
 
Ninety-eight percent of Americans own a cellphone, and 91 percent own a smartphone. The Supreme Court found that in Riley v. California (2014) a “phone not only contains in digital form many sensitive records previously found in the home; it also contains a broad array of private information never found in a home in any form.”
 
Millions of Americans have sensitive information in their phones – apps for alcohol, drug, and gambling addictions; apps for prayer requests; apps for pregnancy symptoms; apps for financial issues; and apps for romance. Cellphones can track Americans’ location, and data that reveals where a person worships, banks, organizes political activities, and a network of friends and associates.
 
If the government may enter the home without a warrant based only on a reasonable belief that an emergency exists – far short of probable cause – the government will surely treat electronic sources of information the same way. The expansion of this doctrine will pose an even greater threat to privacy and the ultimate integrity of the Fourth Amendment.
 
We told the Supreme Court: “The insidious branding almost writes itself: ‘Big Brother’ may be ‘watching you,’ but it is for your own good!” For all these reasons, PPSA urges the Court to grant the petition and hear this case.

​PPSA announced today the filing of an amicus brief asking the U.S. Supreme Court to take up a case in which X Corp., formerly Twitter, objects to surveillance and gag orders that violate the First Amendment and pose a threat to the Fourth and Sixth Amendments as well.
 
When many consumers think of their digital privacy, they think first of what’s on their computers and shared with others by text or email. But the complex, self-regulating network that is the internet is not so simple. Our online searches, texts, images, and emails – including sensitive, personal information about health, mental health, romances, and finances – are backed up on the “cloud,” including data centers like X Corp.’s that distribute storage and computing capacity.
 
Therein lies the greatest vulnerability for government snooping. The growth of data centers is prolific, rising from 2,600 to 5,300 such centers in 2024. And with it, so have government demands for our data.
 
When federal agencies – often without a warrant – seek to access Americans’ personal data, more often than not they go to the companies that store the data in places like these data centers. For years, this power involved large social media and telecom companies. The power of the government to extract data, already robust, increased exponentially with the reauthorization of FISA Section 702 in April, which included what many call the “Make Everyone a Spy Act.” This provision defines an electronic communication service provider as virtually any company that merely has access to equipment, like Wi-Fi and routers, that is used to transmit or store electronic communications.
 
On top of that, the government then slaps the data center or service provider with a Non-Disclosure Order (NDO), a gag order that prevents the company from informing customers that their private information has been reviewed. One such company – X Corp. – has been pressing a constitutional challenge against this practice regarding a government demand for former President Trump’s account data. PPSA has joined in an amicus brief supporting X’s bid for certiorari, asking the Court to consider the constitutional objections to government conscription of companies that host consumers’ data as adjunct spies, while restraining their ability to speak out on this conscription.
 
In the case of X, the government has seized the company’s records on customer communications and then slapped the company with an NDO to force it to shut up about it. The government claims this secrecy is needed to protect the investigation, even though the government itself has already publicized the details of its investigation. Whatever you think of Donald Trump, this is an Orwellian practice.
 
PPSA’s amicus brief informed the Court that the gag order “makes a mockery of the First Amendment’s longstanding precedent governing prior restraints. And it will only become more frequent as third-party cloud storage becomes increasingly common for everything from business records to personal files to communications …”
 
The brief informs the Court: “NDOs can be used to undermine other constitutionally protected rights” beyond the First Amendment. These rights include the short-circuiting of Fourth Amendment rights against warrantless searches and Sixth Amendment rights to a public trial in which a defendant can know the evidence against him.
 
Partial solutions to these short-comings are winding their way through the legislative process. Sen. Mark Warner, Chairman of the Senate Intelligence Committee, introduced legislation to narrow the scope of businesses covered by the new, almost-universal dragooning of businesses large and small as government spies – though House Intelligence Chairman Mike Turner is opposing that reasonable provision. Last year, the House passed the NDO Fairness Act, which requires judicial review and limited disclosures for these restraints on speech and privacy.
 
As partial solutions wend their way through Congress, this case presents a number of well-defined concerns best defined by the Supreme Court.

In this age of “corporate social responsibility,” can a government regulator mount a pressure campaign to persuade businesses to blacklist unpopular speakers and organizations? Would such pressure campaigns force banks, cloud storage companies, and other third parties that hold targeted organizations’ data to compromise their clients’ Fourth as well as their First Amendment rights?
 
These are just some of the questions PPSA is asking the U.S. Supreme Court to weigh in National Rifle Association v. Vullo.  
 
Here's the background on this case: Maria Vullo, then-superintendent of the New York Department of Financial Services, used her regulatory clout over banks and insurance companies in New York to strongarm them into denying financial services to the National Rifle Association. This campaign was waged under an earnest-sounding directive to consider the “reputational risk” of doing business with the NRA and firearms manufacturers.

Vullo imposed consent orders on three insurers that they never again provide policies to the NRA. She issued guidance that encouraged financial services firms to “sever ties” with the NRA and to “continue evaluating and managing their risks, including reputational risks” that could arise from their dealings with the NRA or similar gun promotion organizations.
 
“When a regulator known to slap multi-million fines on companies issues ‘guidance,’ it is not taken as a suggestion,” said Gene Schaerr, PPSA general counsel. “It’s sounds more like, ‘nice store you’ve got here, it’d be shame if anything happened to it.’”
 
The U.S. Court of Appeals for the Second Circuit reversed a lower court’s decision that found that Vullo used threats to force the companies she regulates to cut ties with the NRA. The Second Circuit reasoned that: “The general backlash against gun promotion groups and businesses … could (and likely does) directly affect the New York financial markets; as research shows, a business's response to social issues can directly affect its financial stability in this age of enhanced corporate social responsibility.”

You don’t have to be an enthusiast of the National Rifle Association to see the problems with the Second Circuit’s reasoning. Aren’t executives of New York’s financial services firms better qualified to determine what does and doesn’t “directly affect financial stability” than a regulator in Albany? How aggressive will government become in using its almost unlimited access to buy or subpoena data of a target organization to get its way? We told the Court: “Even the stability of a single company is not enough; the government cannot override the Bill of Rights to slightly reduce the rate of corporate bankruptcies.”
 
In our brief, PPSA informs the U.S. Supreme Court about the dangers of a nebulous, government-imposed “corporate social responsibility standard.” We write:
 
“Using CSR – a controversial theory positing that taking popular or ‘socially responsible’ stances may increase corporate profits – to justify infringement of First Amendment rights poses a grave threat to all Constitutionally-protected individual rights.”
 
PPSA is reminding the Court that the right to free speech and the right to be protected from government surveillance are intwined.

​The Ninth Circuit Court of Appeals in March issued a controversial opinion in Twitter v. Garland that the Electronic Frontier Foundation calls “a new low in judicial deference to classification and national security, even against the nearly inviolable First Amendment right to be free of prior restraints against speech.”
 
X (née Twitter) is appealing this opinion before the U.S. Supreme Court. Whatever you think of X or Elon Musk, this case is an important inflection point for free speech and government surveillance accountability.
 
Among many under-acknowledged aspects of our national security apparatus is the regularity with which the government – through FBI national security letters and secretive FISA orders – demands customer information from online platforms like Facebook and X. In 2014, Twitter sought to publish a report documenting the number of surveillance requests it received from the government the prior year. It was a commendable effort from a private actor to provide a limited measure of transparency in government monitoring of its customers, offering some much-needed public oversight in the process. The FBI and DOJ, of course, denied Twitter’s efforts, and over the past ten years the company has kept up the fight, continuing under its new ownership.
 
At issue is X’s desire to publish the total number of surveillance requests it receives, omitting any identifying details about the targets of those requests. This purpose is noble. It would provide users an important metric in surveillance trends not found in the annual Statistical Transparency Report of the Office of the Director of National Intelligence.

Nevertheless, in April 2020, a federal district court ruled against the company’s efforts at transparency. In March 2023, the Ninth Circuit upheld the lower court’s ruling, sweeping away a substantial body of prior restraint precedent in the process.
 
Specifically, the Ninth Circuit carved out a novel exemption to long established prior restraint limitations: “government restrictions on the disclosure of information transmitted confidentially as part of a legitimate government process.”
 
The implications of this new category of censorable speech are incalculable. To quote the EFF amicus brief:
 
“The consequences of the lower court’s decision are severe and far-reaching. It carves out, for the first time, a whole category of prior restraints that receive no more scrutiny than subsequent punishments for speech—expanding officials’ power to gag virtually anyone who interacts with a government agency and wishes to speak publicly about that interaction.”
 
This is an existential speech issue, far beyond concerns of party or politics. If the ruling is allowed to stand, it sets up a convenient standard for the government to significantly expand its censorship of speech – whether of the left, right or center. Again, quoting EFF, “[i]ndividuals who had interactions with law enforcement or border officials—such as someone being interviewed as a witness to a crime or someone subjected to police misconduct—could be barred from telling their family or going to the press.”
 
Moreover, the ruling is totally incongruous with a body of law that goes back a century. Prior restraints on speech are the most disfavored of speech restrictions because they freeze speech in its entirety (rather than subsequently punishing it). As such, prior restraint is typically subject to the most exacting level of judicial scrutiny. Yet the Ninth Circuit applied a lower level of strict scrutiny, while entirely ignoring the procedural protections typically afforded to plaintiffs in prior restraint cases. As such, the “decision enables the government to unilaterally impose prior restraints on speech about matters of public concern, while restricting recipients’ ability to meaningfully test these gag orders in court.”
 
We stand with X and EFF in urging the Supreme Court to promptly address this alarming development.

​The Colorado Supreme Court issued a 5-2 ruling that leaves an urgent privacy question wreathed in a cloud of ambiguity. As a result, Americans must worry that merely being in the same location as someone who might have done an internet search for suspicious material could end up with their own search data being examined by the police.
 
So-called “reverse warrants” are a powerful new type of search warrant enabled by the collection of Americans’ private data. Reverse warrants allow the police to sift through the search histories of thousands of people. They come in two types: geofence warrants, which allow police to identify people whose devices were in a certain area at a certain time, and reverse keyword warrants, which allow police to identify who searched certain keywords, phrases, or addresses online.
 
These warrants and their underlying technologies allow police to track any person and search through their data. Instead of developing suspicions about a person based on factual evidence and then applying for a warrant to search that specific person – as required by the Fourth Amendment – reverse warrants involve looking through the search history or location history of many innocent people in the hopes of finding a suspect.
 
Reverse warrants exist in legal limbo. There is little precedent or written law that govern this new form of data analysis. Accordingly, some courts have treated reverse warrants as they would any standard warrant.
 
Seymour v. Colorado is the first case to address the constitutionality of reverse warrants. This case springs from a particularly heinous crime – an arson that killed a family of five. Two months later, the Denver Police Department obtained a reverse keyword warrant. As a result of the warrant, Google was forced to hand over the data of eight people, five of whom had Colorado-based IP addresses that had searched for the location of the arson in a two-week period before the crime. Three suspects were eventually charged. One of them, Gavin Seymour, sued to suppress evidence obtained by the warrant on constitutional grounds.
 
The court held that “Seymour has a constitutionally protected privacy interest in his Google search history,” and that “Seymour’s Google search history implicates his right to freedom of expression.” The court also found that law enforcement obtained and executed the warrant in good faith, so the evidence shouldn’t be suppressed under the exclusionary rule.
 
Thus the court acknowledged the serious constitutional issues at play and still treated the reverse warrant as if it was just an ordinary search. The court stated that “the warrant required individualized probable cause and that its absence here rendered the warrant constitutionally defective.” Yet, somehow, it was still admissible evidence.
 
Five innocent people had their data searched. Another five innocent people were murdered in a fire. There is a lot at stake in this case, and a lot to unpack. Does a search of Google search histories by a given address satisfy the Constitution’s requirement for a particularized search? Can probable cause be asserted when the identity of the suspect is unknown? Could digital bystanders have evidence used against them from a search result unrelated to this particular crime?
 
Perhaps this case will advance to the U.S. Supreme Court, which could take this opportunity to articulate boundaries and rules for future searches. We’ve seen, however, a time lag in the Court’s addressing of new technologies. Congress should consider taking measures to protect privacy in reverse warrants before the Supreme Court is forced to weigh in.

The U.S. Supreme Court today declined to hear Wikimedia v. NSA, a lawsuit challenging the mass, secret surveillance of Americans’ online communications.
 
The ACLU had gone to court to challenge a National Security Agency program under the Foreign Intelligence Surveillance Act (FISA), which the agency uses to continuously monitor international and domestic communications across the internet’s main pathways.
 
“In analog terms, it’s as if government agents were opening the international letters passing through a U.S. post office en masse, reading the contents, and then keeping many of those letters in a file for years,” wrote Bob Goodlatte, PPSA Senior Policy Advisor and former Chairman of the House Judiciary Committee, in a recent op-ed.
 
Goodlatte compared this intrusion by the government into American’s emails, web-browsing content, and search engine queries to the “general warrants” of the colonial era that had helped spark the American Revolution.
 
“Worse, the government asserts that this case cannot even be litigated,” said Gene Schaerr, PPSA general counsel. “Under the government’s interpretation of the ‘state secrets’ doctrine, major surveillance programs of the government can never be litigated.
 
“This denial shows all the more reason why Congress needs to step in and use the pending reauthorization of Section 702 – a principal surveillance authority in FISA – to close loopholes the government is exploiting.”

​The Supreme Court will consider whether to hear the Project for Privacy and Surveillance Accountability’s petition in Torcivia v. Suffolk County on Nov. 10.
 
The Second Circuit Court of Appeals ignored the obvious application of a SCOTUS ruling in Caniglia against the police for entering the home of a New York man to confiscate his guns on the basis of the “community caretaking” exception to the Fourth Amendment. The Second Circuit affirmed the right to do the same to another man in New York State on a similar, but more malleable “special needs” doctrine – which is essentially any priority the government deems important.
 
PPSA hopes the Supreme Court grants its petition and takes this opportunity to reinforce the plain meaning of its ruling and the Fourth Amendment.

​Is a “special needs exception” to the Fourth Amendment much different from a “community caretaking exception?” PPSA filed a brief before the U.S. Supreme Court demonstrating that it is not.
 
The U.S. Supreme Court ruled in 2021 in Caniglia that the police acted improperly by entering a man’s home and confiscating his guns under the “community caretaking” doctrine – in which the police are making a “welfare check” rather than acting as law enforcement officers. The High Court saw through this precedent from the 1970s and ruled that supposedly “non-investigative” intrusions into a home are what they seem to be – plain violations of the Fourth Amendment.
 
To the astonishment of many legal observers, the Second Circuit Court of Appeals ignored this unanimous Supreme Court opinion in a nearly identical case. In Torcivia v. Suffolk County, the Second Circuit applied a flexible “special needs exception” to the Fourth Amendment. One familiar example of this exception is when authorities decide that some local requirement, such as curbing drunk driving with spot checks, is necessary. But this case did not involve a car on the highway: it involved warrantless entry into a home and the confiscation of a citizen’s lawfully-owned firearms.
 
The government responded to our petition for the Court to hear Torcivia with the straight-face argument that the community caretaking exception is not the special needs exception. No one claimed it was. But we told the Court that the “logic underlying the special needs exception is indistinguishable from the logic this Court rejected in Caniglia.”
 
Our brief demonstrates to the Court that absent emergency circumstances or consent, if the “government can overcome the warrant requirement that has traditionally protected the home merely by pointing to an interest that the government feels is sufficiently strong, then the Fourth Amendment no longer serves as a meaningful limit on government power.”
 
We added:
 
“Respondents cannot escape that the Second Circuit applied the special needs exception to a seizure of firearms located in the home of a person not on probation or parole. That extension cannot be squared with this Court’s precedents or with the text, history, and tradition of the Fourth Amendment.”