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Thirdly, it will take a lot of time - at least a year (this is assuming that each poison will be given at least 40 minutes). All of the above, in principle, will only help if only one poison has been used, which has not been mixed with anything else. But if an experienced person with a special education is engaged in the case, he is able to poison a person with the help of a single substance by causing the most complicated reactions in the victim's organism.