In Arkansas, there is a kind of David vs. Goliath battle underway over a weedkiller.

On one side, there is the giant Monsanto Company. On the other, a committee of 18 people, mostly farmers and small-business owners, that regulates the use of pesticides in the state. It has banned Monsanto's latest way of killing weeds during the growing season.

Terry Fuller is on that committee. He never intended to pick a fight with a billion-dollar company. "I didn't feel like I was leading the charge," he says. "I felt like I was just trying to do my duty."

Terry Fuller and his identical twin, Jerry Fuller, grow soybeans and raise cattle near the tiny town of Poplar Grove, in eastern Arkansas.