I don't oppose the use of the death penalty for very serious crimes, but I personally feel that a higher standard of judgement should be required for the use of the death penalty than what is required for jailtime.
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I think we should always work to ensure our system becomes less and less likely to convict innocent people, and in cases where there can remaining doubt as to whether or not someone has commited the crime I feel that the death penalty should not be applicable. Of course, I'm not against alternatives being offered to those so sentenced - for instance, we might consider allowing them to volunteer themselves for medical or psychological experiments if they wish to avoid execution.