Once a valid judgment was obtained against an individual, however, the plaintiff could pursue recovery against the assets of the defendant regardless of their location, as other states were obligated by the Full Faith and Credit Clause of the Constitution to recognize such a judgment (i.e. had ceded their power to refuse comity to fellow states of the Union). Violations by a rogue state could be checked via collateral attack: when a plaintiff sought recovery against a defendant's assets in another state, that state could refuse judgment on the grounds that the original judgment was invalid.