This is the most controversial type of drug testing. At face value, random drug testing appears to be a violation of the Fourth Amendment to the United States Constitution which protects the right of citizens "to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures." In addition, the Fourth Amendment states that "no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized" Regardless, the United States Supreme Court ruled in Skinner v. Railway Labor Assn., 489 U.S. 602 (1989) that random drug testing is permissible for employees in safety sensitive positions. Justice Kennedy, speaking for the majority, wrote:
"...the Government interest in testing without a showing of individualized suspicion is compelling. Employees subject to the tests discharge duties fraught with such risks of injury to others that even a momentary lapse of attention can have disastrous consequences based on the interest of the general public..."
and continued:
"While no procedure can identify all impaired employees with ease and perfect accuracy, the FRA regulations supply an effective means of deterring employees engaged in safety-sensitive tasks from using controlled substances or alcohol in the first place."
The dissenting opinion by Justices Marshall and Brennan illustrates the other side of the controversy:
"The issue in this case is not whether declaring a war on illegal drugs is good public policy. The importance of ridding our society of such drugs is, by now, apparent to all. Rather, the issue here is whether the Government's deployment in that war of a particularly Draconian weapon - the compulsory collection and chemical testing of railroad workers' blood and urine - comports with the Fourth Amendment. Precisely because the need for action against the drug scourge is manifest, the need for vigilance against unconstitutional excess is great. History teaches that grave threats to liberty often come in times of urgency, when constitutional rights seem too extravagant to endure. The World War II relocation-camp cases, Hirabayashi v. United States, 320 U.S. 81 (1943); Korematsu v. United States, 323 U.S. 214 (1944), and the Red scare and McCarthy-era internal subversion cases, Schenck v. United States, 249 U.S. 47 (1919); Dennis v. United States, 341 U.S. 494 (1951), are only the most extreme reminders that when we allow fundamental freedoms to be sacrificed in the name of real or perceived exigency, we invariably come to regret it."
In the United States today, random drug testing is used by corporations, drug rehab centers, prisons, the military, police and fire departments, U.S.Government government agencies, and more recently, schools. This method may also be used on teens by their parents, or mandated to be performed on teens at school. The point of a random drug test is deterrence, as the threat of detection is much higher versus other testing methods.Various methods are utilized to determine who gets tested, ranging from drawing names out of a hat, to using more defensible methods such as robust random number generators. The goal of this test is to discourage drug use among employees, inmates, or students by not telling anyone who or when they are to be tested in advance. However, critics claim that random testing introduces a presumption of guilt, and is a violation of privacy if the user is not actually intoxicated during working hours. In addition, random testing is more likely to catch cannabis users, since THC metabolites have a longer duration in the body than those of other drugs.

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