The first case of lethal injection in history, 1982, died in Texas, USA. During the injection, the condemned prisoner is taken to the execution room or the execution vehicle, and the execution bailiff fixes it on the injection bed and connects it with the heart rate measuring instrument. There are three steps in concrete implementation. First of all, the executor will pierce the needle connected with the injection pump into the vein of the condemned man, just like the usual intravenous injection. In this process, managers need special training. Next, the executor makes appropriate adjustments to the injection pump. After the execution order was issued, the executioner pressed the injection button on the injection pump and the drug began to be injected into the condemned prisoner. Soon, the brain waves on the computer screen changed from regular fluctuations to several parallel straight lines, and the changes of brain waves were clearly printed on paper. This will be the main content of the death penalty report. Finally, the forensic doctor will confirm the death of the criminal according to the heartbeat and breathing. Generally, the execution car will drive directly from the court to the crematorium to execute the death penalty on the road, or drive to the outer suburbs to drive to the crematorium after the execution. Although it doesn't hurt, it actually takes about 5 minutes to 8 minutes and 46 seconds from drug injection to the complete death of the criminal (that is, the brain consciousness disappears completely, commonly known as "brain death") (this time varies from person to person). If the execution is carried out on the road, and the execution has reached the crematorium before the complete brain death, then the prisoner will be carried to the furnace arm (that is, "Lickitung" extending from the cremation furnace mouth to meet the body outside the furnace) before the convulsion is over (the brain death is not over yet); Shooting the brain stem, it only takes 0.3 seconds for people to lose consciousness, which is less painful and more humanized. Two drugs are injected into the injection needle in turn. ) The first is to put the prisoner into a high sleep state, and the second is a high concentration of potassium ions. In order to stop the prisoner's heartbeat, in fact, heartbeat and breathing stop are not real deaths, because even in a high sleep state, the prisoner is still conscious and has a strong reaction to brain hypoxia. Think about the reaction of a normal person when the brain is severely ischemic and hypoxic. It's not hard to imagine.