sources of international law
1) treaties
2) customary international law
3) jus cogens norms
4) secondary principles
Binding international law
treaties ratified by that state, customary international law
nonbinding international law
Roper v. Simmons (nonbinding international law test)
is there a national consensus on a constitutional matter?
if yes, court can consider nonbinding international law
traditional international law
laws governing states and their relations
modern international law
laws governing states and their relations and relationships with international orgs (UN, WTO) and relationships with persons (corporations, people)