Overburdened courts.
Our court system already has a tremendous amount of traffic. Death row cases are the long and costly, clogging up the system more than any other.
"...death penalty cases are far more complicated than any other kind of case. They involve double the number of attorneys, more pretrial motions, expensive experts, a longer jury selection process, and far more preparation and time spent in court than other cases. And these costs are only for the trial portion of a death case. Once a death sentence is handed down, the appeals begin and can last for decades."