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A look at the group of people who built the Biosphere 2, a giant replica of the earth's ecosystem, in 1991.

Two Massachusetts drug-testing laboratory technicians are caught tampering with and falsifying drug evidence, and prosecutors are reluctant to disclose the full extent of their criminal behavior.

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

Top state lab chemist Annie Dookhan falls from grace over brazen misconduct and unsettling emails with prosecutors. Farak's trail begins.

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 the officials and the public absorb the fallout's staggering scale.