The Department of of Health and Human Services Center for Food Safety and Applied Nutrition has published a chart of acceptable defects in chocolate.

Acceptable Insect Filth:
It is OK to have 59 insect fragments per 100 grams of chocolate when 6-100 gram subsamples are examined, although the batch must be rejected if any one of the 6 subsamples contains 90 or more insect fragments.

Acceptable Rodent Filth:
5 rodent hairs in the 6-100gram subsamples.

Cocoa Beans:
4% can be moldy
4% can be insect damaged or infested.
6% can be moldy and insect infested
9.9 mg of mammalian excreta per pound is allowable.

In addition, Chocolate raises serum glucose, cholesterol, tryglycerides, and uric acid; upsets the endocrine balance; interferes with protein metabolism; and depletes magnesium, zinc and chromium