What is the difference in saliva testing versus urine testing?

Saliva testing involves collecting a saliva, rather than urine, sample, which automatically means the tests are less invasive, easier to administer, and more comfortable for individuals. Whereas urine testing can detect drug use for up to several days or even weeks, saliva testing is better for rapid frontline testing, typically detecting drug use within the past 24-48 hours. Over all, saliva testing is best for situations when there is a need for rapid and frequent testing.