Ever since international humanitarian law (IHL) was first codified the States, as contracting parties, have undertaken to adopt every measure necessary to implement their obligations under the relevant treaties. The duty to ensure implementation derives from the customary rule whereby the parties to a treaty must carry out its provisions in good faith. In addition, the Geneva Conventions of 1949 and their Additional Protocols of 1977 set forth special means of implementation which strengthen and specify this customary rule and apply from the moment a treaty enters into force. One such provision is Art. 6 of Protocol I, entitled “Qualified persons”.