Abstract
In 2011, Mexico implemented landmark reforms aimed at recognizing, protecting, and promoting human rights under both conventional (international) and constitutional frameworks. This established the "Constitutional Regularity Parameter," a legal doctrine requiring the harmonization of international human rights standards with domestic law and mandating state compliance, however, the 2024 constitutional reforms—dubbed "Plan C"—purportedly designed to make institutions "more accessible to the people" and "strengthen democracy," have raised serious concerns. This research paper analyzes the scope and impact of Plan C on both conventional and constitutional human rights, arguing that it violates core principles such as progressivity—a cornerstone of international human rights law, through a documentary analysis of legal texts (international treaties, conventions), academic literature, and journalistic sources, this work demonstrates that Plan C creates significant legal uncertainties in human rights protection. Far from advancing rights, the reforms signal a clear regression, excluding critical legal safeguards and leaving systemic gaps in Mexico's obligations under international law.