Sobriety checkpoints are apparently illegal here. Never ran into one in California, but they sure loved to run them back there, and are apparently branching out into running checkpoints simply to check license and registration.
Texas Illegal under Texas' interpretation of federal Constitution. State v. Holt, 887 S.W. 2d 16 (Tex. Cr. App. 1994) Because the checkpoint the U.S. Supreme Court upheld in Michigan v. Sitz, 496 U.S. 444 (1990), was legislatively authorized, the Texas court held that absent such authorization a checkpoint is illegal under the U.S. Constitution. There is no specific language in Sitz requiring such an interpretation.