Conventionality Control in Mexican Law

Introduction

Conventionality control (control de convencionalidad) is a judicial doctrine requiring all state authorities, particularly judges, to review domestic laws and acts for consistency with international human rights treaties. In Mexico, this doctrine was established following the Inter-American Court’s judgment in Rosendo Radilla Pacheco v. Mexico (2009) and the SCJN’s compliance ruling in Expediente Varios 912/2010. All Mexican judges are now required to exercise conventionality control ex officio.

Origin and Development

The doctrine of conventionality control was developed by the Inter-American Court of Human Rights, first articulated in Almonacid Arellano v. Chile (2006). The Court held that judges are bound to ensure that domestic laws have effects consistent with the American Convention on Human Rights. In Rosendo Radilla v. Mexico, the Inter-American Court specifically required Mexico to implement conventionality control at the domestic level.

Implementation in Mexico

The SCJN, in its compliance ruling, mandated that all Mexican judges exercise conventionality control. The Court established that conventionality control includes both the Constitution and international human rights treaties (the “bloc of constitutionality”). Judges must examine whether a domestic law or act is compatible with international human rights obligations and, where incompatibility is found, must apply the international standard.

Ex Officio Application

Conventionality control must be exercised ex officio by all judges in all cases, regardless of whether the parties have raised international human rights arguments. This obligation arises from the judge’s duty to ensure that their decisions are consistent with the entire legal order, including international human rights norms. The SCJN has provided guidelines on how lower courts should exercise this control.

Relationship with Constitutional Review

Conventionality control operates alongside constitutional review but is distinct from it. While constitutional review examines the compatibility of laws with the Constitution, conventionality control examines compatibility with international human rights treaties. The two forms of control are complementary and, under the bloc of constitutionality doctrine, international human rights norms form part of the constitutional standard of review.

Conclusion

Conventionality control has become an integral part of Mexican judicial practice, requiring all judges to ensure consistency between domestic law and international human rights standards. This doctrine has strengthened human rights protection and embedded international law within the domestic legal order, making Mexico a leading example of the implementation of Inter-American human rights standards.