Suicide is a tricky question. In certain states its still officially a crime so obviously in those states suicide would need to be decriminalized first. I think this largely depends on the mechanism. Should a prisoner for a capital offense be allowed to volunteer for lethal injection? I think if it is established that they are of sound mind, and understand the consequences of their action and still elect to choose this route its inhumane to say they have to stay alive in jail against their will. Of course I don't want to explore the full consequences of this, I certainly wouldn't want the government to be legally obligated to allow suicide of say military prisoners with strategic information.