Now that Tookie Williams was just put to death the justications for and against Capital Punsihment are in full discussion around the world. If you belive or not in Capital Punishment just looking into the facts of the costs involved in the administration the procedure is a good reason to abolish the procedure.
Here is some of the the data on costs just for Kansas alone.
The investigation costs for death-sentence cases were about 3 times greater than for non-death cases
The trial costs for death cases were about 16 times greater than for non-death cases ($508,000 for death case; $32,000 for non-death case).
The appeal costs for death cases were 21 times greater.
The costs of carrying out (i.e. incarceration and/or execution) a death sentence were about half the costs of carrying out a non-death sentence in a comparable case.
Trials involving a death sentence averaged 34 days, including jury selection; non-death trials averaged about 9 days.

For more information go to Death Penalty Information Network