Urine drug test devices are based on the principle of competitive reaction between a drug or drug metabolites which may be present in a donor’s sample.\r\rThe sample during the test migrates upward and hydrates the test strip. The mixture then migrates along the membrane by capillary action to the immobilized drug-protein (or antibody) band on the test region. \r\rWhen a drug is absent in the sample, the colored antibody will bind specifically to form a visible line in the test region.\r\rIf someone is impaired by one or more illicit or prescription drug, by using a drug test kit, it’s possible to detect the presence of many drugs simultaneously.\r\rHere are some most commonly abused: Marijuana, Methamphetamine, Ecstasy, Cocaine, and Heroin (opiate). Not forgetting prescribed drugs like Ambien, Oxycodone, Percocet, and Adderall. By following the information below, you can learn more about drug testing and understand what it’s all about.