Constitutional Law

Jus Cogens

A peremptory norm of international law from which no derogation is permitted — for example, the prohibition on torture, genocide, and slavery. These norms bind all states regardless of treaty.

Legal Definition

Jus cogens (Latin: "compelling law") norms are the highest category of international law — fundamental principles from which no state can derogate, even by treaty. The Constitution of South Africa requires courts to interpret the Bill of Rights consistently with international law. Jus cogens norms (prohibition of torture, prohibition of slavery, prohibition of genocide, right to self-determination) inform the interpretation of constitutional rights.

📖 Constitutional / Statutory Basis: Section 39(1)(b) — courts must consider international law; Section 233 — courts must prefer international law-consistent interpretation

Practical Example

The Constitutional Court considers the absolute prohibition on torture (a jus cogens norm) when interpreting section 12 of the Constitution, which prohibits torture and cruel treatment.

Frequently Asked Questions

Can South Africa derogate from jus cogens norms in a national emergency?

No. Jus cogens norms cannot be derogated from under any circumstances, including national emergency. Section 37 of the Constitution lists non-derogable rights (which overlap substantially with jus cogens norms).

What are the main jus cogens norms relevant to South African law?

Prohibition of torture and cruel treatment (section 12); prohibition of genocide; prohibition of slavery (section 13); non-refoulement in refugee law; right to self-determination. These norms inform interpretation of the Bill of Rights.

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