Oral fluid drug screening in a mouth swab has certain advantages over the screening of other biological fluids such as urine and blood. Oral fluid is readily accessible, and is less likely to be adulterated. With oral fluid tests the drugs may be detected immediately after ingestion, even before they are metabolized and would show up in urine. Oral fluid screen tests by Drugcheck SalivaScan devices will detect both alcohol & drugs of abuse. See our newest featured saliva swab products SalivaScan™ and iScreen™. iScreen and the NEW SalivaScan Oral Swab carry an 12-18 month shelf life with a 30 day product satisfaction guarantee by REI.