A drug test is a procedure used to determine the presence of certain substances in a person's body. The three crossword solutions for the term 'drug test' are TRIAL (5 letters), ASSAY (5 letters), and passa (5 letters). A TRIAL is a formal examination of evidence in a court of law, while an ASSAY is an analysis of a substance to determine its components. Passa is a type of drug test that uses urine samples to detect the presence of drugs in the body.