Beating Drug Tests and Defending Positive Results: A General Overview.- Pharmacology of Commonly Abused Drugs.- Workplace Drug Testing: SAMHSA and Non-SAMHSA Drugs.- Synthetic Urine, Flushing, Detoxifying, and Related Agents for Beating Urine Drug Tests: Are They Effective?.- Household Chemicals and Internet Based Products for Beating Urine Drug Tests.- Adulterating Hair, Oral Fluid, and Sweat Specimens for Drug Testing.- Defending Positive Opiate and Marijuana Test Results.- Defending Positive Cocaine Tests.- Defending Positive Amphetamine Results.- Analytical True Positives in Workplace Drugs Testings Due to Use of Prescription and OTC Medications.