Toxicology testing is a scientific process used to identify and measure harmful substances in various samples, such as blood, urine, or tissues. This testing helps determine if a person has been exposed to toxic chemicals, drugs, or poisons, and assesses the potential effects on health. The results of toxicology tests are crucial in medical settings, legal cases, and environmental assessments. They can guide treatment decisions, support criminal investigations, and evaluate the safety of products. Common substances tested include alcohol, drugs, and heavy metals, among others.