Reciprocity between the states derives from the Full Faith and Credit clause found in Article IV, Section 1 of the United States Constitution.

Full faith and credit require each state to honor the legal judgments of other states, including divorce. This idea has been enlarged in other areas, and now many states share what are termed reciprocal laws.

In family law, reciprocity often applies to the enforcement of order is issued, and it is transmitted to the court in the initiating state.

As it applies to divorce, reciprocity means the states must recognize the divorces granted in sister states.

The term reciprocity is large enough to include cooperation among and between jurisdictions in a number of areas of law, for example, the rendition of fugitives. The term judgment of other jurisdictions.

See Full Faith and Credit; Comity.