Two months after releasing an alarming report on herbicides in cereals and other food marketed to children, an environmental advocacy group is back with additional findings. 

A new report found glyphosate, a weed-killing chemical that some health authorities link to cancer, in a number of popular breakfast foods and cereals marketed to children. 

According to a new study, the so-called "Erin Brockovich" carcinogen is in about two thirds of the drinking water throughout the country. But some of the highest concentrations are in Norman, Oklahoma.