I agree with economical capital punishment, and while I have reservations about organ harvesting in most cases, it should be considered. The main reservation is that future corrupt governments may desire to put a man on trail who has his son's rare bone marrow or other more serious body part, leading to the potential for serious corruption. In the case of heinous crimes, who would really want that part, though many may to save their life, so it really has to be multiple eyewitness murder as per what a Jewish court would convict for me to accept that.
However, I still believe a healthy gestation period is in order, even for the most serious offenders, in order to insure that no further information comes to light which may change the result of the case. Economical imprisonment is also in order as well.