After 33 years in prison, DNA testing exonerates Keith Harward and proved the faultiness of the bite evidence; the bitemark analysis field hosts intense in-fighting and government investigations.
Suburban mom Audrey Edmunds was convicted of shaking a neighbor's baby to death, but she was freed after 11 years when the pathologist who testified against her admitted he was no longer sure about shaken baby syndrome.
David Gavitt served almost 27 years in prison before new arson investigation science exonerated him, but countless others remain behind bars; the science behind crime scene investigations moves forward, but legal precedent only looks backward.