How Many Prisoners Are in Solitary Confinement in the United States?

The number of inmates held in solitary confinement in the United States has been notoriously difficult to determine. Most states do not publish the relevant data, and many do not even collect it. Attempts to come up with a figure have been denounced as imperfect, based on state-by-state variances and shortcomings in data-gathering and in conceptions of what constitutes […]