Which method is often used to determine the presence of toxins in a body?

Biochemical analysis is the method most commonly employed to determine the presence of toxins in a body due to its ability to quantitatively and qualitatively measure specific substances in biological samples such as blood, urine, or tissue. This method utilizes various techniques, such as chromatography, mass spectrometry, and immunoassays, to identify and classify toxic compounds with high sensitivity and specificity.

Visual inspection alone cannot reveal the presence of toxins since it relies on observable signs and symptoms, which may not always correlate with toxic exposure. Similarly, physical examination may indicate health issues but typically lacks the precision needed to detect specific toxic substances. Interrogation techniques involve questioning individuals about their experiences or actions and do not provide scientific data regarding toxins present in a body. Hence, biochemical analysis stands out as the definitive approach for identifying toxins in forensic investigations.