Drug toxicology test This is useful screening test for drug abuse person A drug toxicology test (tox screen) detects the presence of legal or illegal substances—including alcohol, opioids, amphetamines, and marijuana—in biological samples like urine, blood, or hair. These tests are used for workplace screening, legal requirements, or medical evaluation to detect recent drug usage, generally within days or weeks depending on the dose #toxicology_test #laboratory #medicalstudent #kmu #awareness