Country-of-origin labels: voluntary?

Unless Congress does something weird, Country-of-Origin Labeling (COOL) will go into effect this spring. Apparently, some companies are already doing it. I’m traveling this week and bought a little packet of Snak Club Tropical Mix at an airport news stand, thinking that it would be mostly raisins and peanuts, which it mostly was. The COOL was an unexpected bonus although I hardly know what to make of it: “Product of U.S.A., may contain ingredients from Thailand and/or Phillipines [sic] and/or Mexico and/or China and/or Chile and/or Argentina.” Somehow, I’m guessing that this is not what proponents of COOL had in mind, exactly.