Justice Scalia, joined by Justice Stevens, emphasized that the issue was not whether Customs could discipline or dismiss employees for unlawful drug use. The constitutional question was whether the Government could detect that use through a suspicionless bodily search that he considered highly intrusive, humiliating, and destructive of personal dignity.
In his view, a suspicionless bodily search could be reasonable only where the Government showed a genuine, demonstrated problem within the targeted field and a demonstrated connection between the searched-for conduct and grave harm. He found such evidence in Skinner's railroad context, but not in the Customs Service.
The majority's asserted harms were speculative. The record did not show that Customs employees used drugs at a meaningful rate, that drug use had caused bribery, poor firearm performance, weakened drug enforcement, or compromise of classified information, or that urinalysis would materially prevent those harms. The Commissioner's own statements that Customs was largely drug-free, along with the very small number of positive tests, underscored the lack of an established problem.
Justice Scalia warned that permitting testing of all employees who carry firearms would expose a vast range of public employees to similar searches. The same logic could extend to workers who drive vehicles, operate equipment, or possess confidential information, greatly weakening Fourth Amendment protection against suspicionless bodily searches.
He concluded that the true purpose of the program was symbolic: to demonstrate governmental seriousness in the war on drugs and to project a clean law-enforcement image. Symbolism, however worthy its goal, could not justify an otherwise unreasonable invasion of privacy and dignity.