Why are wrongly-convicted people still imprisoned in Missouri?

Last May, something extraordinary happened in a Missouri courthouse: Jean Peters Baker, the Jackson County prosecutor, issued a public apology to a man she believes was wrongfully convicted.

"My job is to apologize," she said. "It is important to recognize when the system has made wrongs … and what we did in this case was wrong. "So, to Mr. Strickland, I am profoundly sorry."