National Surprise Drug Test Day is observed annually on April 21 in the United States, following National Marijuana Day on April 20. This unofficial holiday arose as a response from parents and employers who began conducting surprise drug tests on children and employees after the marijuana celebrations. The day has sparked debates regarding the ethics of mandatory drug testing, particularly for marijuana users in states where its use is legal. Advocacy groups argue that it is unfair for employees to risk their jobs due to marijuana use off the clock, while proponents of drug testing emphasize the necessity of maintaining a drug-free workplace, especially in safety-sensitive industries. National Surprise Drug Test Day serves as a platform for discussions about drug use and its implications in the workplace.