Twenty years on: the enduring impact of the ICRC customary IHL study and database

The ICRC’s 2005 study on customary international humanitarian law – along with the free, public database launched five years later – arrived at a moment when the legal landscape of armed conflict was rapidly shifting. Mandated by the 26th International Conference of the Red Cross and Red Crescent, the study set out to map the customary rules governing contemporary warfare by systematically analyzing global state practice and opinio juris. Twenty years on, with more than 130 armed conflicts active worldwide, reassessing the study’s methodological contributions, its evidence base, and its impact on the regulation of both international and non-international armed conflicts offers a timely lens on how customary IHL continues to underpin protections for people affected by war. In this post, ICRC Legal Adviser Claudia Maritano and members of the British Red Cross-ICRC customary IHL research team reflect on how the study’s rigorous methodology, global scope, and identification of 161 customary rules helped clarify gaps left by treaties, especially in non-international armed conflicts, and strengthen the practical application of IHL.

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Twenty years on: the enduring impact of the ICRC customary IHL study and database is an episode from ICRC Humanitarian Law and Policy Blog by ICRC Humanitarian Law & Policy Blog.

This episode is 00:14:19 long.

This episode was published on Dec 11, 2025.

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