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umm i think because it kills you painfully and the prisoner would've probably killed more than 2 people or 1
So lethal injection was supposed to be a quick, not very painful way of executing prisoners. However, the drug is actually said to cause a lot of pain and the people feel like they’re suffocating as they pass. It is also controversial because of the amount of people who have been put on death row and/or executed when they have been proven innocent.