<P> In the law of the United States, the Comity Clause is another term for the Privileges and Immunities Clause of the Article Four of the United States Constitution, which provides that "The Citizens of each State shall be entitled to all Privileges and Immunities of Citizens in the several States ." Article Four as a whole--which includes the Privileges and Immunities Clause, the Extradition Clause, and the Full Faith and Credit Clause--has been described as the "interstate comity" article of the Constitution . </P> <P> In the United States, some states and territories recognize professional engineer licenses granted in a different jurisdiction, depending on the holder's education and experience (a practice called "licensure by comity"). Rules differ significantly from jurisdiction to jurisdiction . </P>

The principle of comity in private international law