EXAMPLES OF CUSTOMARY NORMS RECOGNIZED BY THE PH SUPREME COURT
a. Rules and principles of land warfare and of humanitarian law under the Hague Convention and the Geneva Convention [Kuroda v. Jalandoni, G.R. No. L-2662 (1949)];
b. Pacta sunt servanda [La Chemise Lacoste v. Fernandez, G.R. No. L-63796-97 (1984)];
c. Human rights as defined under the Universal Declaration of Human Rights [Reyes v. Bagatsing, G.R. No. L-65366 (1983)];
d. The principle of restrictive sovereign immunity [Sanders v. Veridiano, G.R. No. L-46930 (1988)];
e. The principle in diplomatic law that the receiving state has the special duty to protect the premises of the diplomatic mission of the sending state [Reyes v. Bagatsing, G.R. No. L-65366 (1983)];
f. The right of a citizen to return to his own country [Marcos v. Manglapus, G.R. No. 88211 (1989)];
g. The principle that “a foreign army allowed to march through friendly country or to be stationed in it, by permission of its government or sovereign, is exempt from criminal jurisdiction of the place” [Raquiza v. Bradford, G.R. No. L-44 (1945)];
h. The principle that judicial acts, not of a political complexion of a de facto government established by the military occupant in an enemy territory, are valid under international law [Montebon v. Director of Prisons, G.R. No. L-1352 (1947)];
i. The principle that private property seized and used by the enemy in times of war under circumstances not constituting valid requisition does not become enemy property and its private ownership is retained, the enemy having acquired only its temporary use [Noceda v. Escobar, G.R. No. L-2939 (1950)];
j. The principle that a State has the right to protect itself and its revenues, a right not limited to its own territory but extending to the high seas [Asaali v. Commissioner, G.R. No. L-24170 (1968)]