The Protection That Dissolved: United States v. Miller and the Constitutional Precondition for Programmable Money

The holding

On April 21, 1976, the Supreme Court decided United States v. Miller by a vote of seven to two, Justice Lewis Powell writing. The holding, stated in the opinion's own terms, is that bank records are not subject to protection under the Fourth Amendment. ¹

The reasoning rests on two propositions. First, that the documents in question — microfilms of checks, deposit slips, and account records — are "the business records of the banks" rather than the depositor's private papers, and the depositor has no possession or control over them. ² Second, and more consequentially:

"The Fourth Amendment does not prohibit the obtaining of information revealed to a third party and conveyed by him to Government authorities, even if the information is revealed on the assumption that it will be used only for a limited purpose and the confidence placed in the third party will not be betrayed." ³

The clause after the comma is the one that matters, and it is worth reading twice. The protection is lost not merely when a person shares information indifferently, but when he shares it on the express understanding that it will go no further.

The two preceding essays in this series traced what corporations gained across two centuries of case law — standing to sue, constitutional protection for their charters, Fourteenth Amendment personhood by way of a reporter's headnote, and eventually political speech. This essay traces what individuals lost over the same period, and the loss arrives through the same institutional door. Deveaux in 1809 was a bank. Bellotti in 1978 was a bank. Miller in 1976 was a bank.

How the records came to exist

The records at issue existed because federal law required banks to keep them.

The Bank Secrecy Act of 1970 imposed recordkeeping and reporting obligations on financial institutions, requiring them to retain copies of customer transactions and report certain categories to the government. ⁴ The statute was challenged and upheld in California Bankers Association v. Shultz (1974), over dissents from Justices Douglas, Brennan, and Marshall. ⁵

The sequence therefore runs: the government requires banks to create records of customer transactions, and then holds that customers have no constitutional interest in the records the government required to be created.

Miller's attorney made exactly this argument. The Fifth Circuit had accepted it, reversing his conviction on the ground that a depositor's Fourth Amendment rights are violated when bank records maintained pursuant to the Bank Secrecy Act are obtained by means of a defective subpoena. ⁶ The lower court characterized the mechanism as the government "first requiring a third party bank to copy all of its depositors' personal checks and then, with an improper invocation of legal process," obtaining them. ²

The Supreme Court reversed. The Act's recordkeeping requirements, it held, do not alter or create a Fourth Amendment interest of a bank depositor in the bank's records of his account, and the Act "is not a novel means designed to circumvent established Fourth Amendment rights" because it was already settled before the statute that an IRS summons to a third-party bank does not violate a depositor's rights. ²

Brennan's dissent

Justice Brennan dissented, joined in substance by Justice Marshall, and his argument is the one worth preserving because it anticipates the present moment with unusual precision.

Brennan's position was that a depositor does retain a reasonable expectation of privacy in bank records, and his ground was the character of the conveyance:

"For all practical purposes, the disclosure by individuals or business firms of their financial affairs to a bank is not entirely volitional, since it is impossible to participate in the economic life of contemporary society without maintaining a bank account." ⁷

A person who must use a bank in order to participate in economic life has not chosen to share his financial history. He has been required to.

Marshall dissented separately, reiterating his position from California Bankers that the Bank Secrecy Act was itself unconstitutional and would lead to violations of Fourth Amendment rights. ⁵

The framework regards Brennan's objection as the hinge of this entire essay, and will return to it, because the condition he described as making the conveyance involuntary in 1976 has since become considerably stronger.

What the doctrine became

Miller did not remain a case about bank records.

Three years later, Smith v. Maryland (1979) applied the same reasoning to telephone records, holding that a person has no legitimate expectation of privacy in the numbers he dials because he conveys them to the phone company. ⁸ Together the two cases established what is now called the third-party doctrine: information a person voluntarily provides to a third party is no longer covered by a reasonable expectation of privacy, and the government may obtain it without a warrant. ⁹

The doctrine's reach expanded with the economy's intermediation. It is the constitutional basis on which the government obtains, without a warrant, transactional records held by banks, telephone carriers, internet service providers, and the long list of intermediaries through which modern life is conducted.

Carpenter v. United States (2018) qualified it, narrowly. The Court held five to four that the Fourth Amendment requires a warrant for extended cell-site location data, notwithstanding that the data is held by a third-party carrier. ¹⁰ Carpenter is a genuine limit and the framework notes it as such. But it is explicitly a narrow one, resting on the specific character of comprehensive location tracking, and it did not overrule Miller. Bank records remain where Miller put them.

Why this is the precondition

This catalog has documented, across several essays, an architecture under construction: the programmability of central bank digital currency, including geographic restrictions, merchant category limits, and expiration; a resolution regime under which deposits above a guarantee threshold are convertible by administrative determination; and an identity layer with published deadlines converging on the same window.

What those essays did not identify is the constitutional question underneath all of it, and Miller is the answer.

Consider the structure of the claim. Fourth Amendment protection attaches to a person's papers and effects. A physical banknote in a pocket is an effect — its existence, its denomination, and its use are not recorded anywhere, and obtaining information about them requires a search. A digital balance held at an intermediary is a record about a person, held by someone else, and under Miller it is the intermediary's business record in which the person has no protectable interest.

The implication is direct and the framework states it plainly:

In a financial system where every transaction is intermediated, no financial act is constitutionally private — and no one had to repeal anything to reach that result.

The protection does not have to be removed. It simply never attaches, because the condition that triggers it — the person's own possession of his own papers — has been designed out of the system.

This is the same structural pattern the two preceding essays identified. The charter limits were not abolished by argument; they were competed away. Corporate constitutional rights were not granted; they accumulated through narrow holdings. And financial privacy is not being repealed; it is being rendered inapplicable by a change in how money is held.

Each is a case of a consequential outcome arriving without a decision that produced it.

Brennan's objection, strengthened

The sharpest point available to this essay is that Brennan's dissent did not merely anticipate the present. It understated it.

Brennan argued in 1976 that conveyance to a bank is not voluntary because banking services are a necessity of modern commerce. That was a strong claim at the time and the majority rejected it. A person in 1976 could, with difficulty and inconvenience, conduct a substantial portion of economic life in cash.

In a system where physical currency has been retired and the unit of account exists only as a ledger entry at a supervised intermediary, the conveyance is not merely practically unavoidable. It is definitionally unavoidable, because there is no form in which the asset can be held that does not involve an intermediary record.

Brennan's argument was that a forced conveyance should not forfeit constitutional protection. The majority held that the voluntariness question did not control. A reader may reasonably conclude that the majority's reasoning, whatever its merits in 1976, was never tested against a system in which the alternative does not exist.

What the framework does not claim

Three limits on the argument, stated because the argument is strong enough not to need overstatement.

This is not a claim about intent. Nobody decided Miller in 1976 in order to enable a cashless architecture in the 2020s. The decision concerned a whiskey tax prosecution. The connection drawn here is structural, not conspiratorial, and this catalog has repeatedly found that structural connections of this kind require no coordination to produce their effects.

Statutory protection exists and is not nothing. Congress responded to Miller with the Right to Financial Privacy Act of 1978, which imposes procedural requirements on federal agencies seeking customer records. That is a real protection. It is also a statute rather than a constitutional rule, which means it can be amended by ordinary legislation and contains exceptions — a materially weaker position than the one Miller's lawyers were arguing for.

Carpenter shows the doctrine is not frozen. The Court has demonstrated willingness to limit the third-party doctrine where the information is comprehensive enough. An argument that digital financial records in a cashless system present the same character as the location data in Carpenter is available, and the framework regards it as the most plausible route to a different outcome.

The three essays together

This series began with a question about why the institution commonly called capitalism attracts a moral complaint that its defenders find unrecognizable.

The answer developed across three essays is that the complaint is aimed at something else — an institution assembled over two centuries by mechanisms that nobody controlled and no one voted on.

The charter expired, and then it stopped expiring. Purpose limits, duration limits, capitalization caps, and the prohibition on owning other corporations were competed away by states seeking revenue, with New Jersey leading and Delaware copying. Brandeis documented it from the bench in 1933 and observed that under the earlier rules "the holding company was impossible."

The entity acquired standing. Through narrow holdings beginning with a bank in 1809 and running through a reporter's headnote in 1886 to a bank's political speech in 1978, the corporation accumulated constitutional rights against the government that creates it — never by a decision addressing what it had become, because no case presents that question.

And the individual lost his own. In 1976, again through a bank, the Court held that a person has no constitutional interest in the records of his own financial life, because he gave them to someone else.

Menger's account of capital describes the formation of higher-order goods through saving and voluntary exchange. That process is not what any of the three essays describe. What they describe is a legal technology for assembling capital, which outlived its limits, acquired rights against its creator, and now operates in a system where the individual's financial existence is a business record belonging to somebody else.

Those are different subjects. Treating them as one has served the second well for a hundred years.

---

Sources

A note on the Right to Financial Privacy Act. Congress responded to Miller with the Right to Financial Privacy Act of 1978, 12 U.S.C. §§ 3401–3422, which imposes notice and procedural requirements on federal agencies seeking customer financial records. The framework notes this in the text as a real but statutory protection, subject to amendment by ordinary legislation and containing enumerated exceptions, and therefore materially weaker than the constitutional rule Miller's counsel sought.

Framework cross-references. Article 40 (central bank digital currency programmability — geographic restrictions, merchant category limits, expiration — and the digital yuan as operational prototype); Article 43 (threat models and the protective properties of bearer instruments); Article 53 (consequential outcomes produced by open, uncoordinated mechanisms); Article 54 (resolution authority operating on claims, and the latency argument regarding unified ledgers); Article 55 (the identity, payment and resolution layers and their published timelines); Articles 57 and 58 (the first two essays of this series).

Footnotes

1. United States v. Miller, 425 U.S. 435 (1976). Argued January 12, 1976; decided April 21, 1976. Seven to two, Powell, J. The holding that bank records are not subject to protection under the Fourth Amendment. Official report: https://www.govinfo.gov/content/pkg/USREPORTS-425/pdf/USREPORTS-425-435.pdf — Full text also at https://supreme.justia.com/cases/federal/us/425/435/ ↩

2. Miller, 425 U.S. 435. Source for the characterization of the documents as "the business records of the banks"; for the holding that "the Act's recordkeeping requirements do not alter" the Fourth Amendment interest of a depositor; for the statement that "the Bank Secrecy Act is not a novel means designed to circumvent established Fourth Amendment rights"; and for the quoted Fifth Circuit characterization of the government "first requiring a third party bank to copy all of its depositors' personal checks and then, with an improper invocation of legal process," obtaining them. See the case report at https://openjurist.org/425/us/435 ↩ ↩² ↩³

3. Miller, 425 U.S. at 443. Verified against the official report: "This Court has held repeatedly that the Fourth Amendment does not prohibit the obtaining of information revealed to a third party and conveyed by him to Government authorities, even if the information is revealed on the assumption that it will be used only for a limited purpose and the confidence placed in the third party will not be betrayed." The passage is quoted here from "The Fourth Amendment" onward. ↩

4. Bank Secrecy Act of 1970, 84 Stat. 1114. The recordkeeping and reporting requirements imposed on financial institutions, pursuant to which the records at issue in Miller were maintained. ↩

5. California Bankers Association v. Shultz, 416 U.S. 21 (1974), upholding the Bank Secrecy Act's recordkeeping requirements. Justice Marshall's dissent in Miller reiterated his dissent in California Bankers, maintaining that the Act was unconstitutional and would lead to violations of Fourth Amendment rights. https://supreme.justia.com/cases/federal/us/416/21/ ↩ ↩²

6. United States v. Miller, 500 F.2d 751 (5th Cir. 1974), reversed. The Court of Appeals had held "that a depositor's Fourth Amendment rights are violated when bank records maintained pursuant to the Bank Secrecy Act are obtained by means of a defective subpoena." ↩

7. Miller, 425 U.S. 435, Brennan, J., dissenting. Verified against the official report: "For all practical purposes, the disclosure by individuals or business firms of their financial affairs to a bank is not entirely volitional, since it is impossible to participate in the economic life of contemporary society without maintaining a bank account." Brennan reaches the point by adopting the reasoning of the California Supreme Court in Burrows v. Superior Court under the practically identical phrasing of the state constitutional provision, and the sentence quoted is from the passage he sets out. ↩

8. Smith v. Maryland, 442 U.S. 735 (1979). Application of the third-party reasoning to telephone calling records. https://supreme.justia.com/cases/federal/us/442/735/ ↩

9. Congressional Research Service, "The Fourth Amendment Third-Party Doctrine," Report R43586. https://www.everycrsreport.com/reports/R43586.html — "In two of the most prominent third-party cases, Smith v. Maryland and United States v. Miller, the Court held that government access to telephone calling records and bank records, respectively, were not Fourth Amendment searches for which warrants were required." The doctrine "generally finds that information that a person provides voluntarily to a third-party no longer is covered by expectation of privacy, and the government can obtain such information without a warrant." ↩

10. Carpenter v. United States, 585 U.S. 296 (2018). Five to four; the Fourth Amendment requires a warrant for extended cell-site location records notwithstanding that the data is held by a third-party carrier. https://supreme.justia.com/cases/federal/us/585/16-402/ — The decision partially qualified the third-party doctrine without overruling Miller. ↩