Before switching operations to agriculture, Monsanto was the primary manufacturer of PCBs, which was used for paints, electrical equipment and other products, from 1935 until 1977. The U.S. Environmental Protection Agency (EPA) banned PCBs in 1979 due to its link to birth defects and cancer in laboratory animals. PCBs can have adverse skin and liver effects in humans and can also linger in the environment for many decades.
By Rebekah Wilce
The world of independent chemical testing has a shiny veneer. The public is reassured that chemicals they're exposed to on a daily basis are certified by technicians in spotless white lab coats who carefully conduct scientific studies, including on animals in neat rows of cages.
But a federal grand jury investigation that ended with convictions in the early 1980s discovered that Industrial Bio-Test Laboratories (IBT), the largest such lab in the U.S., conducted trials with mice that regularly drowned in their feeding troughs. The dead animals would decompose so quickly that "their bodies oozed through wire cage bottoms and lay in purple puddles on the dropping trays." IBT even invented an acronym "TBD/TDA" for its raw safety data, later discovered to mean "too badly decomposed."