...The Fourth Amendment requires that searches and seizures be reasonable. A search or seizure is ordinarily unreasonable in the absence of individualized suspicion of wrongdoing. Chandler v. Miller, 520 U. S. 305, 308 (1997). While such suspicion is not an "irreducible" component of reasonableness, Martinez-Fuerte, 428 U. S., at 561, we have recognized only limited circumstances in which the usual rule does not apply. For example, we have upheld certain regimes of suspicion less searches where the program was designed to serve "special needs, beyond the normal need for law enforcement." See, e. g., Vernonia School Dist. J,7J v. Acton, 515 U. S. 646 (1995) (random drug testing of student athletes); Treasury Employees v. Von Raab, 489 U. S. 656 (1989) (drug tests for United States Customs Service employees seeking transfer or promotion to certain positions); Skinner v. Railway Labor Executives' Assn., 489 U. S. 602 (1989) (drug and alcohol tests for railway employees involved in train accidents or found to be in violation of particular safety regulations). We have also allowed searches for certain administrative purposes without particularized suspicion of misconduct, provided that those searches are appropriately limited. See, e. g., New York v. Burger, 482 U. S. 691, 702-704 (1987) (warrantless administrative inspection of premises of "closely regulated" business); Michigan v. Tyler, 436 U. S. 499, 507-509, 511-512 (1978) (administrative inspection of fire-damaged premises to determine cause of blaze); Camara v. Municipal Court of City and County of San Francisco, 387 U. S. 523, 534-539 (1967) (administrative inspection to ensure compliance with city housing code).
We have also upheld brief, suspicion less seizures of motorists at a fixed Border Patrol checkpoint designed to intercept illegal aliens, Martinez-Fuerte, supra, and at a sobriety checkpoint aimed at removing drunk drivers from the road, Michigan Dept. of State Police v. Sitz, 496 U. S. 444 (1990). In addition, in Delaware v. Prouse, 440 U. S. 648, 663 (1979), we suggested that a similar type of roadblock with the purpose of verifying drivers' licenses and vehicle registrations would be permissible. In none of these cases, however, did we indicate approval of a checkpoint program whose primary purpose was to detect evidence of ordinary criminal wrongdoing....