Some of the worst offenders supply major brands with national reach, such as Perdue, Tyson, Costco, and H-E-B.

Perdue Farms is a fourth-generation, family-owned, U.S. food and agriculture company. Through our belief in responsible food and agriculture, we are empowering consumers, customers, and farmers ...

In addition, Perdue reports that it has completed the conversion of its ... Tyson, which already uses CAS at its turkey plant and two of its chicken plants, reports plans to convert four more plants ...