http://r7lscypevibgtindwowzyhqlajsi767kmmoq3nmo4otyy3ixqzzl4did.onion
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. Suppose, when some seemingly harmless substance A is injected, under the influence of enzymes it is broken down and substance B is formed, from which substance C appears and so on.