Credibility of companies for kashrut

Hi,

If a government-inspected company publishes a statement that they use vegetable oil rather than animal-based oil, that statement is credible, where they are not aware that the issue involved is one of kashrut. This is information the accuracy of which could easily be checked, and they would be seriously harmed by lying.

(Rav Moshe Feinstein, Igrot Moshe Yoreh Deah 1:55 [see more there])

Have a great day,
Mordechai