Country

Justice and public safety in the United States

The United States is a federation in which the states hold reserved powers, most policing, prosecution, courts and prisons are organised below the federal level, many law-enforcement and prosecution offices are filled by local election, and tribal nations exercise inherent sovereignty.

Fact-checkedSafety review clearedLast updated 24 July 2026Last reviewed 24 July 2026

Institutional facts on these pages were checked against their sources on 24 July 2026. Where a cited provision carries a scheduled change, the page states the date.

The United States is a federation, and its defining feature for justice is decentralisation. The Tenth Amendment to the Constitution provides that "the powers not delegated to the United States by the Constitution, nor prohibited by it to the states, are reserved to the states respectively, or to the people." The federal government holds enumerated powers; general authority rests with the states.

Two features make the US harder to summarise than the federal systems described elsewhere on this site. First, many of the officials who run local justice institutions are elected, not appointed: the head of a sheriff’s office is usually an elected sheriff, and chief local prosecutors are commonly elected too. Second, the country contains more than one kind of sovereign.

The court system is doubled. As the federal judiciary puts it, the federal government and each state government have their own separate court systems. A matter is heard in a federal court or a state court depending chiefly on the law involved, and most criminal, contract, family and probate cases are matters for state courts.

Prosecution is doubled in the same way. Federal prosecutors — the United States Attorneys — are appointed by the President and confirmed by the Senate and prosecute federal offences. State and local prosecution is organised separately by each state, and its chief prosecutors carry different titles from one state to the next.

Jurisdictions modelled

A territory can exist administratively without being a separate legal jurisdiction. This table records, for each modelled tier and territory, whether it has its own arrangement for a function, whether the function is organised nationally, or whether we have simply not researched it.

Functional scope of each modelled United States jurisdiction
Jurisdiction	Level	Courts	Prosecution	Policing
United States of America	federal	shared	shared	shared
State of California	state	own	own	own
State of Louisiana	state	own	own	own
District of Columbia	special	unknown	unknown	unknown
Tribal jurisdiction (United States)	tribal	own	unknown	own

unknown means not researched. It is never a synonym for none: an unresearched territory does not inherit the metropolitan arrangement.

What has not been researched

These areas have no page. That is a statement about our research, not about the United States: each of these institutions exists, and we have simply not established enough from primary sources to write about it responsibly.

Forensic systemNot researched: Forensic services in the US are distributed across federal, state, county and municipal laboratories with no single national organisation, and no source on that structure has been read. A description assembled from general knowledge would assert a uniformity that does not exist, in a safety-sensitive section where the editorial policy forbids exactly that.
Border and customsNot researched: The federal border, customs, immigration and coast functions are carried by several distinct agencies whose statutory roles have not been researched. Collapsing customs, immigration enforcement, border policing and maritime security into one description is the specific error this module exists to prevent, so it is better absent than approximated.
Oversight and accountabilityNot researched: Oversight in the US is as fragmented as the institutions it watches — federal inspectors general, state and local mechanisms, courts, civilian review boards that exist in some cities and not others, and elections themselves as a form of accountability for sheriffs and prosecutors. A single national oversight page would imply a uniform national model that does not exist, and none of these mechanisms has been researched to the standard required.
Institutional historyNot researched: US institutional history is inseparable from the history of slavery, Reconstruction, segregation, and the treatment of Native nations, and cannot be written responsibly from general knowledge. It requires archival and scholarly sources not consulted here, and a national summary would erase exactly the state, tribal, constitutional and racial complexity that makes the history matter.
Institutional timelineNot researched: A timeline requires each milestone to carry its own verified source and jurisdiction. The dated facts established in this pilot — the Tenth Amendment (1791), Public Law 280 (1953), the DC Home Rule Act (1973) — are not a timeline, and filling the gap with recalled dates is the decorative-timeline failure the standards warn against.

Sources

Tenth Amendment to the Constitution of the United States
Legal Information Institute, Cornell Law School (reproducing the enacted constitutional text) · Legislation · 1791-12-15 · link verified 2026-07-24
Verbatim text: 'The powers not delegated to the United States by the Constitution, nor prohibited by it to the states, are reserved to the states respectively, or to the people.' Supports the reserved-powers structure of US federalism — that the states, not the federal government, hold residual authority. Cornell LII reproduces the enacted text; the constitutional text itself is authoritative. Does NOT support any claim about how a particular power is allocated in practice.
Comparing Federal & State Courts
Administrative Office of the U.S. Courts (uscourts.gov) · Government publication · link verified 2026-07-24
The federal judiciary's own account. Supports: that the federal and state governments each have their own separate court systems; the federal structure of U.S. district courts, U.S. courts of appeals and the Supreme Court created under Article III; that each state establishes its own courts through its constitution and laws and that state systems vary; and the broad division of case types (federal courts hear cases on the Constitution, federal law, disputes between states, admiralty, bankruptcy, habeas; state courts hear most criminal, contract, tort, family and probate matters). Supports court STRUCTURE only; not caseload, effectiveness or the competence thresholds within any state.