Calling a product kosher to has legal ramifications. Printing a trademarked kosher symbol on a product without certification is illegal. Kashruth organisations somewhat routinely catch products misrepresented as kosher. There are various different responses from kosher agency appropriate for each particular case.
The only goal of a Kashruth agency is to ensure the integrity of kosher products for the Jewish community. Recently a consumer sued in court Adee Flour Mills for misusing there logo. The company was fined 25,000 dollars for the “spiritual trauma” they caused by having a COR on Devil’s Food cake mix.