Preliminary investigations into the deaths of six people at a Northern Colorado dairy farm point toward the dairy farm workers being exposed to the toxic gas known as hydrogen sulfide, or "H2S." The workers, who include a boy who was still in high school , were killed while working on a dairy farm in Keensburg, a town in southeastern Weld County.

CBS

"This has, unfortunately, happened on dairy farms across the country," said David Douphrate, a dairy farm safety expert and Associate Director of the High Plains and Intermountain Center for Agriculture and Safety , an entity headquartered at Colorado State University.

While Douphrate has heard of tragic fatalities related to H2S, he said this is the first time he has seen so many killed in one location at one time by the gas.

"I

See Full Page