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Report: Scratching the surface on wrongful convictions

Solano Prison

California Department of Corrections and Rehabilitation / EPA

Researchers say it's impossible to know how many people in prison are actually innocent of their crimes.

Researchers at the University of Michigan's Law School have done something unprecedented: over the weekend, they released the country's first register of wrongful convictions. The main lesson from this wealth of data, however, is that there's much we still don't know about how many innocent people are currently in prison and why they're there.

Culling data from news reports, innocence projects, lawyers, and academics, the report looked at the country's 873 known exonerations since 1989. "If that were the extent of the problem, we would be encouraged by these numbers," researchers wrote. "But it’s not. These cases merely point to a much larger number of tragedies that we do not know about."

The register lists 79 exonerations from California and 23 from Los Angeles County, the third highest of any county in the nation. That number doesn't include "group exonerations," like the 100-150 cases dismissed after the Rampart scandal. Most of those cases involved drugs and firearms—lesser charges than found in most exoneration cases.