What is the current state of the law on border searches?

For example, border searches have generally been recognized as permissible even though without warrant or probable cause, and even where there has been no justifiable suspicion of illegality. Although specifically allowed by statute, such searches must still pass constitutional muster. Such searches have been upheld not as "exceptions to the rule," but as being reasonable in the light of the government's sovereign right to protect its borders. United States v. Ramsey, 431 U.S. 606, 97 S.Ct. 1972, 52 L.Ed.2d 617 (1977).