"Critics say it’s expensive, ineffective and even dangerous, but the U.S. puts more people in prolonged isolation than most other countries in the world. Now, some officials at the state and federal level are beginning to review the practice. FRONTLINE brought together some of these officials for a conversation about the use of solitary confinement in the state and federal prison system today. We wanted to understand what’s happening on the ground, what works, what doesn’t, and what the future looks like for America’s prisons." The corrections professionals involved in this roundtable are Jim Austin, Bob Hood, and Bernie Warner. Topics discussed include: how inmates get placed in segregated housing; litigation resulting in legislative changes; special administrative measures (SAMs); length of stay; release back into the general population; gang influence; and the future.