Looking at individuals as different as John Steele(Marvel) and New Wave(DC), I felt compelled to pop the question- how do you imprison/execute individuals who cannot die or are impervious to age or death by conventional means and whose execution or lifelong imprisonment would raise a host of (US at least) constitutional matters( OK New Wave can be incarcerated in a test tube/giant bottle- but as she can transmute her body into water-which of all the elements is arguably the most indestructible; it can be turned into ice or steam-but sooner or later returns to its natural liquid state, this means that she is functionally immortal. How long would be before she literally started to exhibit signs of prison psychosis- "stir crazy". And the mechanics of executing such a woman-far less the cost of conventional imprisonment alone- would drive most state or Federal authorities crazy?)
Much of the previous observations about New Wave apply to John Steele( who, his seeming death notwithstanding, has been around for nearly two centuries ; he was made immortal/indestructible in 1865, and presumably fought in not just the US Civil War but the Spanish-American and both World Wars). True, he could be placed in an adamantium based cell( but the cost alone would be prohibitive).
Any thoughts on this matter?