The scene: A half-dozen white corrections officers at Clinton Correctional Facility in Dannemora, N.Y., are confronting an African-American inmate named Leonard Strickland. It's video of a closed world, invisible to most of us.
"Stay on the wall, do you understand me?" officers shout. "Don't move."
Strickland, who had been diagnosed with schizophrenia, appears dazed and unresponsive, and then he collapses.