The constitutional text

Article I · Section 9

Select any highlighted phrase to understand what it means.

The Migration or Importation of such Persons as any of the States now existing shall think proper to admit, shall not be prohibited by the Congress prior to the Year one thousand eight hundred and eight, but a Tax or duty may be imposed on such Importation, not exceeding ten dollars for each Person

The Privilege of the Writ of Habeas Corpus shall not be suspended, unless when in Cases of Rebellion or Invasion the public Safety may require it.

No Bill of Attainder or ex post facto Law shall be passed.

[No Capitation, or other direct, Tax shall be laid, unless in Proportion to the Census or Enumeration herein before directed to be taken.]*

No Tax or Duty shall be laid on Articles exported from any State

No Preference shall be given by any Regulation of Commerce or Revenue to the Ports of one State over those of another: nor shall Vessels bound to, or from, one State, be obliged to enter, clear, or pay Duties in another.

No Money shall be drawn from the Treasury, but in Consequence of Appropriations made by Law; and a regular Statement and Account of the Receipts and Expenditures of all public Money shall be published from time to time.

No Title of Nobility shall be granted by the United States: And no Person holding any Office of Profit or Trust under them, shall, without the Consent of the Congress, accept of any present, Emolument, Office, or Title, of any kind whatever, from any King, Prince, or foreign State.

Source: National Constitution Center edition. Original wording is preserved; commentary explains historical and superseded provisions.

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Article I, Section 9, Clause 2

Judicial inquiry into detention

Current text
The Privilege of the Writ of Habeas Corpus shall not be suspended, unless when in Cases of Rebellion or Invasion the public Safety may require it.

What it means

Habeas corpus permits a court to examine the legal basis for detention. Its privilege may be suspended only when rebellion or invasion and the requirements of public safety satisfy the constitutional conditions.

Historical setting

The writ developed as a safeguard against unlawful confinement in the English legal tradition. The Constitution protects it in the original text, showing that restraints on coercion were part of the structure before the Bill of Rights.

What it does

Suspension is an exceptional measure, not the ordinary condition of criminal justice or national security policy. The clause does not itself define every procedural detail or fully settle which institution may act in every disputed emergency.

Debate & interpretation

The hardest cases concern how a government can respond to genuine danger without making detention unreviewable on its own assertion. The specified emergencies limit the argument; public safety is not an independent catchall detached from rebellion or invasion.

A common misreading

Habeas corpus does not guarantee that every detained person goes free; it requires lawful justification and an available judicial inquiry unless validly suspended.

Think it through

Why is review of the legal authority to detain someone important even before a court considers guilt or innocence?

Follow the connection

Sources & further reading

Original Madison Center commentary. Explanations distinguish the text, historical context, and interpretive disagreements.

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