Could you be more explicit as to why?..nothing involving the use of the justice system implies any freedom from coercion. In fact, it’s the exact opposite: it’s the one legal place where we may use coercion.
As I explained in a previous post, the purpose of punishment for crimes is to protect the innocent, both by keeping the criminal away from society for a period of time, and by deterring would-be criminals from committing crimes. In each case, everyone in the rest of society gets what he is morally entitled to get: freedom from coercion (well, to the extent that the justice system actually works of course). No one is entitled to an unearned benefit because of a crime, so there is no justification for using criminals to ‘benefit society’ apart from whatever compensation to individual victims the court may decide to impose in a civil suit. The moral use of coercion in the justice system is of a specific, limited nature: retaliatory force, the coercion necessary to impose the sentence (or arrest the person with probable cause). Make no mistake though, he is still under coercion and an agreement he makes, post-sentencing, to commute his death sentence to play a game of Russian Roulette in a game show, be a crash test dummy, take drugs with unknown effects, etc are not valid. Note that plea bargains are done in advance of a trial, where the outcome is not certain and it is there that any sort of ‘medical experiment’ or ‘community service’ deal could properly be made. Waiting until after the trial, sentencing him to death, and then offering him some (possibly grisly in the case of experimentation) alternative is not a valid agreement. It is treating him like property.
I don’t want to de-rail the thread but one could make the argument that community service is the same thing. I would say that it is not, and is a proper use of sentencing for three reasons: (1) community service is the sentence, decided by the judge or pre-trial by a plea bargain so it is objective and knowable beforehand, (2) community service is a defined punishment, whereas “the outcome of an experiment” is not, and (3) the primary purpose of community service is punishment, not road beautification (or whatever); that is just an incidental benefit, and the same purpose could be served by having the prisoners stack and unstack blocks. There is no incentive to imprison more people in order to clean more highways (not least because hiring someone is cheaper and easier). In this thread’s proposal, medical experimentation is the main purpose and prisoners are convenient subjects. If you want to say punishment is the purpose and medical knowledge is secondary, then that is both unpredictable and possibly cruel and unusual depending on the effects.
Incidentally, the taser/arrest analogy is not really a valid comparison for a couple of reasons. The most obvious being, the suspect cannot choose the taser over arrest (if he resists, he is tasered and arrested, so there are not really two alternatives to choose from, barring escape). The arrest itself is not really a punishment; someone is only detained on probable cause and has a chance to prove his innocence and avoid punishment. Finally, by resisting arrest the suspect is defying the justice system and the taser is not meant as a punishment per se, but is merely a means to force compliance and is therefore retaliatory force (since the resistor is suspected of initiating force).
Yeah D’Kian, I specifically had Known Space in mind when writing these replies: one of my favourite organ-bank stories involves a man about to be sentenced to death who escapes and destroys an organ bank before being caught. He is not charged, because the prosecutor knows the jury will find him guilty of minor traffic violations and sentence him to death, but at least when he hears his sentence, he can feel like he really did something deserving of death instead of just being a sacrificial goat.
Edit: Yep it was long: you asked for it!