When someone is poisoned to death, a forensic pathologist / toxicologist must undergo the difficult task of determining what the poison was killed the victim.

The reason that the poisons are very popular because they can hide. Toxic substances very rarely leave tracks visible to the naked eye. Therefore, the search for a toxin is a difficult task that requires more specific tests and consist of a variety of body fluids and tissues.

The best hiding places for these Toxins are places where chemicals enter the body, meeting the chemicals in the body, and along the routes of elimination. Therefore the stomach contents, blood and tissue surrounding the needle injection sites may contain high doses of the toxic substance. Analysis of brain, liver and other tissues may disclose to the coroner, when a drug or its metabolites accumulated. Finally, a urinalysis may be an indication of where the substances are concentrated toxic metabolic products and their disposal. Here is a list of potential hiding places "for illegal toxic substances:

• Blood: Blood is perhaps the most useful tool the forensic toxicologist for the discovery of toxins. With today's procedures toxicological we essentially find drugs and their main products in the blood. A blood toxicologist says what was happening in the body at death. Concentrations drugs and drugs in the blood are proportional to levels of intoxication and with levels that can potentially kill a person.
• The content of stomach: Hospitals typically "pump" the stomach contents of the survivors of drug overdoses through a gastric tube inserted through the nostril into the stomach. Once the contents of the stomach is removed, washed to remove acids from the stomach and the proof of presence of drugs or poisons. During the autopsy, medical examiners test the stomach contents in the same way. How in the stomach is crucial in the investigation suspected of poisoning or overdose. The concentrations of all drugs found in the stomach is not necessarily proportional to its level in the blood and therefore its effects about an individual.
• Urinalysis: A urine test is common for drug testing in the workplace. It may also be useful during the autopsy. As the kidneys serve as a major stash the body and how to eliminate toxins, forensic medical examiners / toxicologists can find many Sometimes these toxic substances in higher concentrations in the urine. However, the relationship between urine concentration of a drug and its effects on the body lacks of proportion. This means that the level of urine can disclose the substance was toxic in the blood at some earlier time. It determines whether the drug had no effect on the person at the time of collection.
• Hair: The hair has the unique ability to provide a schedule of intoxication by many substances toxic, like lead, arsenic and other heavy metals.
• Vitreous Humor: Inside the cavity of the eye, there is a fluid called vitreous humor. This liquid does not rot easily as other body tissues. In badly decomposed body, this fluid may be the remains of a body that can be tested. Levels concentration of drug in the vitreous of May behind the levels of drug concentrations in the blood of approximately 1 to 2 hours. Therefore, the reveals vitreous control the concentration of a toxic substance in the blood 1 to 2 hours in advance.
• Liver: The Role liver to metabolize (break down) drugs and toxins. Evidence of liver and bile that occurs often reveals the presence of a drug or its metabolites, products of metabolism of drugs. Forensic investigators can measure drug concentrations in the liver for many drugs, especially opioids, can be found in liver and bile, even when blood tests do not provide the drugs. The liver may indicate a concentration of drugs during the hours preceding death, and bile can say what drugs were present in the system during the three or four days. However, no test is accurate.
• Insects: Forensic scientists may try to insects that feed on the bodies of the drug if it's too decomposed body. Since particular drug tend to reside in the tissues of these flaws, which can provide information on whether a drug is present in the victim.

These places are the most common places to find evidence of drugs or other toxic materials in case of suspected murder.

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