His last night as a prisoner in North Florida, Kelvin Bolton couldn’t sleep. Fifty-five years old, with a wispy goatee the same color as the gray flecks in his hair, he was about to get out after serving a 2 1/2-year sentence for theft and battery. The last time he’d seen his brothers and sisters at a big family gathering, he’d marched onto the dance floor ostentatiously, turned away and wrapped his arms around himself to caress his own back.