Last week, Iowa Gov. Kim Reynolds joined 10 other governors in a letter to congressional leaders, asking for the reintroduction and passage of the Exposing Agricultural Trade Suppression Act, or EATS Act, aimed at mitigating the impact of California’s Proposition 12, or Prop 12.

Recently upheld by the U.S. Supreme Court, Prop 12 regulates how livestock must be raised before the meat can be sold in California. The rule, set to take full effect ...