This is a link to a Guardian report of the execution by lethal injection of Dennis McGuire on 16th. January. McGuire had been on death row for 24 years. New drugs are currently beign trialled in the US, and there is much controversy about the possible inhumane nature of these drugs. This report, and the videoed interview, should leave the matter beyond doubt.
My views on the death penalty apart, I cannot comprehend how it can be possible to do this to a human being, when I have witnessed many patients being anaesthetised in seconds, and a horse (a larger creature, by any standards) being put down quickly and humanely, with no apparent suffering. This clip also demonstrates the devastating effect of execution on families.