3. Abrin
Abrin is similar to the previous entry on our list of untraceable drugs and poisons that cause death in humans but the difference is that even smaller dosage is required to kill a person. Depending on the exposure (inhalation, ingestion or injection) symptoms can occur in a matter of hours. They are similar to ricin and include problems with breathing, nausea, chest pain and low blood pressure. Respiratory failure follows and leads to death. Due to the fact that lesser dosage of this poison is lethal, Abrin is even harder to detect then ricin. But as ricin, it leaves obvious marks so it really doesn’t make a big difference.
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