The lethal injection is the practice of injecting someone with a lethal amount of drugs. Lethal injection was introduced in 1888, however the government still liked hanging as a capital punishment. It wasn't until 2004 that lethal injection is starting to be used in the United States and now most states and is now the most widely used execution in the world. It was used to kill some people in world war ll, in Germany. As is it a cheap execution, clean execution, and a more humane execution. When the drugs are injected it puts the person to sleep, then stops breathing, and finally the heart stops for a quick and painless death.