Kraft foods has paid a fine of several thousand dollars after state inspectors in Wisconsin alledgedly found underweight packages of their meats in some stores:
http://www.usatoday.com/money/industrie ... 54844906/1
I wonder if occurrences like this happen very often with all kinds of packaged foods, etc. I never would think to look for anything like this so I guess it's a good thing there are inspectors out there who do look for it.