I believe each state could have better fail safes in justice, but only God knows for sure.
My personal beliefs in DP must meet minimum:
1. Killed more then one person(occupation does not matter, and definately if the occupation played no part in the crime.)
2. Killed or tortured one or more children
3. Must have one last hearing prior to sentence be carried out for up to date evidence review.
4. Must have eye witnesses or direct witnesses, ie they didn't see the incident but viewed within seconds of the event.
5. If evidence is not over whelming, sentence must be reduced to life without parole.
If the state can't offer llife without parole, then death must be seriously considered. (sad that LWOP would be unconstitutional, but death is.)
The death penalty should not be the "go to" sentence, it should be reserved for the worst of criminals.