A Massachusetts town sued Monsanto after the town renovated one of its schools to be free from PCB, a common additive to building materials, like paint and caulking, that has been linked to negative health effects (in paint and other products).
The town claimed that the company failed to do anything about the caulking that contained PCB, though it clearly took steps to discourage certain uses of PCB containing paint and other products decades ago. After spending millions to renovate and remove all the PCB containing caulking, the town filed suit against the makers of the PCB, rather than the makers of the caulking. The lawsuit was dismissed by the federal district court, and the First Circuit has denied the town's appeal.