Lex Posterior Derogat Legi Priori

The legal maxim 'Lex Posterior Derogat Legi Priori' states that if two laws are in conflict, the later statute prevails over the earlier one. This principle ensures that the most recent legislative intent is honored in the event of inconsistency between laws.

The maxim has roots in Roman law, where the idea that later legislation supersedes earlier statutes was crucial in maintaining a coherent legal framework. It has been adopted in various legal systems, including common law jurisdictions.

In modern law, courts frequently rely on this maxim to resolve conflicts between statutes enacted at different times. It upholds the principle of legislative supremacy, ensuring that newer laws reflect current social values and policy priorities.

• If State A enacts a new environmental regulation that contradicts an older law from the same state regarding pollution control, the new law takes precedence.
• A recent amendment to a criminal law that alters sentencing guidelines will override previous sentencing provisions that no longer align with the updated statute.

• Lowe v. City of Los Angeles, 303 F.3d 365 (9th Cir. 2002) - The court considered conflicting statutes and applied the maxim to determine the validity of the newer law.