Damning evidence reveals drug lab chemist Sonja Farak’s addictions. A scandal erupts, raising questions for the thousands of defendants in her cases.

Farak’s disturbing confessions lay bare a broken system. Dookhan takes the fall in court, but suspicions of a high-level cover-up grow louder.

The ACLU and dogged defense lawyers fight for justice in the tainted cases as officials and the public absorb the fallout’s staggering scale.