Explain the scientific examination of toxicology samples (TLC, GC, GC-MS).

Forensic toxicology — the poisons-and-drugs science: the detection, the measurement, the interpretation. The classification's faces:1. By the origin: the chemical (the pesticides, the metals), the plant (the alkaloids — the datura, strychnine, opium's derivatives), the animal (the venoms), the gases (the carbon monoxide, the cyanide).2. By the action: the corrosives (the acids-and-alkalis), the irritants (the metals, the plant's poisons), the neurotoxins (the opioids, the sedatives, the alcohols), the asphyxiants.3. By the use: the agricultural (the organophosphates — the pesticides' epidemic: the suicides'- and-homicides' common poison of South Asia), the pharmaceuticals, the drugs of abuse (U8), the household's faces.4. By the case's type: the acute (the single dose) vs the chronic (the repeated exposure).