contains very little thc -- the compound that makes people high. seth doane checked out the crop. >> vincenzo fornara showed us his now-empty farm, once packed with more than 600 sheep. for generations, our family produced ricotta and meat. he recalled. until 2008, when italy's government discovered the toxic chemical dioxin in his sheep and slaughtered the entire herd. the culprit -- just a mile away. contaminants spewing from this massive steel plant - europe's largest - meant fornaro could never have grazing animals again. to clean up his land - he decided to try a rather unusual experiment. he's growing marijuana. fornaro planted industrial hemp to try to leech contaminants from the soil. the science is called