The Arson Research Project says that 30 men and women have been exonerated from wrongful arson convictions since 1991. More than half of them were exonerated from life sentences or from death row. In the case of one Texas inmate, Cameron Todd Willingham, the research project says, such forensic error led to the execution of an innocent man.
To help prevent such tragedies in the future, the Arson Research Project, which is affiliated at Monterey College of Law, has published an excellent report, Anatomy of a Wrongful Arson Conviction, which you can download here.
The center’s director, Paul Bieber, presents a good video summary on wrongful arson convictions and the difficulty reversing them, here.