There are a few key differences between oral fluid and urine drug testing. Perhaps the biggest difference is that the urine collection is typically unsupervised, while the entire process of the saliva collection is supervised. The opportunity to cheat is ruled out. Detection times vary, with most substances detectable in saliva within 30 minutes of ingestion, so drug detection times are generally five to 48 hours. Urine samples, however, can take up to seven days. Post-accident and reasonable suspicion drug testing make oral fluid drug tests the best for recent drug use. Urine testing can be used to detect the potential for repeated drug use.
