Thank you for using the Jiskha Homework Help Forum. In addition to presenting the facts against capital punishment, you might also present the facts for, with your rebuttal to those. Here are some things to read:
looks at exonerations and identifies factors which led to wrongful convictions, such as unreliable witnesses. The exoneraton rate is significantly higher in cases were DNA testing can be used to detemine guilt or innocence.
This then leads to the conclusion that there are many innocent people in jail who cannot prove their innocence using DNA.