ICRC databases on international humanitarian law
Treaties, States Parties and Commentaries
Treaties and Documents
Geneva Conventions of 1949 and Additional Protocols, and their Commentaries
Historical Treaties and Documents
Declaration concerning the Laws of Naval War. London, 26 February 1909.
Chapter II : Contraband of war - Art. 40.
Art. 40. A vessel carrying contraband may be condemned if the contraband, reckoned either by value, weight, volume, or freight, forms more than half the cargo.