@Silverchild79,
i'm not voting because my option isn't there.
I would vote "let them chose".
In the same way that you and I have the right to be organ donors, they should have the right to chose if they want to be studied for scientific research.
If the research prolongs their execution date, so be it.
But, there's flaws in this method as well... some scientist somewhere MIGHT know someone on the row and might do all he can to study him forever, to avoid the death penalty.