An autopsy is a thorough examination of a body after death, aiming to determine the cause and manner of death. In toxicology, autopsies are essential for detecting and quantifying the presence of toxins, drugs, or chemicals in the body. This helps ascertain whether these substances contributed to or caused the individual's death. Through detailed analysis of tissues, blood, and other bodily fluids, toxicologists can identify substances that may not be apparent through external examination alone.