No, LITTLE questions still remain about the death penalty. Trivial, picayune questions. Immaterial questions. Dishonest, delaying, obfuscating questions asked by liars, fools, and traitors.
The big questions about the death penalty were answered a long time ago ... in the Old Testament.
Convicted murderers have NO constitutional right to a 100% pain-free execution, but Judge Parker's hangman came pretty dang close. In a career spanning over a decade, be did not have a single botched hanging.
With all the sleezebags we have on death row awaiting execution, I'm sure we could develop someone with the skill of Judge Parker's hangman with just a little more practice. Heck, I'm willing to volunteer if needed.