127 people on death rows released with proof that they were wrongfully convicted. DNA, available in less than 10% of all homicides, can’t guarantee we won’t execute innocent people.

The death penalty doesn’t prevent others from committing murder. No reliable study shows the death penalty deters others. Homicide rates are higher in states and regions that have it than in those that don’t.

We have a good alternative, life without parole, on the books in 48 states. It means what it says. Life without parole costs less than the death penalty.

The death penalty costs much more than life in prison, mostly because of the legal process which is supposed to prevent executions of innocent people.

The death penalty isn’t reserved for the worst crimes, but for defendants with the worst lawyers. It doesn’t apply to people with money. When is the last time a wealthy person was on death row, let alone executed?

The death penalty doesn’t necessarily help families of murder victims. Murder victim family members have testified that the drawn-out death penalty process is painful for them and that life without parole is an appropriate alternative.

Problems with speeding up the process. Over 50 of the innocent people released from death row had already served over a decade. Speed up the process and we will execute innocent people.
References :
Death Penalty Information Center, http://www.deathpenaltyinfo.org, for stats on executions and states where they occurred, reports on costs, deterrence studies, links to FBI crime stats and links to testimony (at state legislatures) of victims’ family members.

FBI http://www.fbi.gov/ucr/cius2006/data/table_04.html

The Innocence Project, http://www.innocenceproject.org

http://www.deathpenaltyinfo.org/COcosttestimony.pdf page 3 and 4 on why the death penalty is so expensive