The lawsuit was first filed in 2015 by whistleblower and former Duke employee Joseph Thomas. The Justice Department took it over afterward. The suit claims the faked research was conducted by former research technician Erin Potts-Kant, who was supervised by pulmonary medicine researcher William Michael Foster. Foster's lab experimented with mice, seeking to determine the effects of inhaling diesel exhaust, among other tests. Several research papers by Foster's team were later retracted.