Why? If we pay to keep somebody alive for 20 years when we could kill them in minutes how do you figure? I know when I’ve had to put my cat down it was only $40 for the injection. But feeding, housing, health-care & protecting killers costs less? Show proof please, I’m interested in seeing this... To me that sounds impossible
Here's a link to the study.
http://www.thejusticeproject.org/press/reports/pdfs/21740.pdf