Forensic toxicology refers to the branch of science that deals with the study of chemicals or drugs found in the human body to determine their effects or potential role in legal matters. It is used to analyze substances present in bodily fluids or tissues to help uncover causes of injury, illness, or death, and provides valuable evidence in criminal investigations or legal proceedings. In simpler terms, forensic toxicology investigates how certain substances can impact the human body and their involvement in legal cases.