Imagine if you will, a few years from now, scientists have developed a foolproof test for truth. A lie detector, a truth serum? Doesn't matter what it is. It is infallible. It gets the truth of the matter every time. (Please try not to get bogged down by the fact that such a thing may never be possible, assume it is.)
A violent repeat offender (murderer, rapist) is found guilty by way of this truth device. Using the device authorities are able to ascertain that the offender has no remorse and fully intends to go on with his wicked ways should he ever be released from prison. He is not mentally ill, he's just a nasty b*st*rd.
Do you support the death penalty in a case like this?