Detecting drug use with a saliva drug test kit is a clean and easy drug screening technique. Specimens are collected while the donor is under observation, which makes it harder for the donor to tamper with the results. The iScreen Oral Fluid 6 collection is much less invasive and embarrassing than urine drug testing. Quality saliva oral fluid drug tests. Order online and salve on iScreen oral fluid 6, iScreen oral 6 is a dynamic saliva drug test kit detecting up to 6 drugs Saliva drug test kits detect traces of drug (or drugs) in oral fluids from the donor. Since drugs and drug metabolites (residues) do not remain in oral fluids as long as they do in urine, this method shows more promise in determining current use and impairment.