1Episode 1
Damning evidence reveals drug lab chemist Sonja Farak's addictions. A scandal erupts, raising questions for the thousands of defendants in her cases.
2Episode 2
Top state lab chemist Annie Dookhan falls from grace over brazen misconduct and unsettling emails with prosecutors. Farak's trial begins.
3Episode 3
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.
4Episode 4
The ACLU and dogged defense lawyers fight for justice in the tainted cases as officials and the public absorb the fallout's staggering scale.