When compared to urine and hair drug tests, oral fluid is best at detecting recent drug use. Drugs take time to metabolize and pass through the system in a urine test, and the same drugs are incorporated as hair grows and it takes time for the drug to be present in the hair above the scalp. But an oral fluid test will often detect drugs in a donor’s system immediately after use. This makes oral fluid testing ideal for a broad range of testing situations ranging from pre-employment, to reasonable suspicion, to post-accident testing where the employer is interested in assessing what’s in the donors system at the time of the drug test collection.