Sorry, you can't do anything, and it isn't just [the store] ...... I didn't eat for days after I first researched this...
If you do some research, you will be SHOCKED to find that bugs and bug parts and rodent hairs are PERMITTED in foods. You will have to request the document that enumerates how many of each...... Read, and you'll be hurling your innards......
And, this refers to MACROanalytictal not Micro.
http://www.fda.gov/Food/ScienceResearch/LaboratoryMethods/MacroanalyticalProceduresManualMPM/ucm083194.htm#deter
Sources of Defects (Field vs. Storage) -- Insects, molds, and rodents are the principal causative agents for most of the defects covered by macroanalytical methods. In general these agents may be classified as either "field" or "storage" pests. In the field or orchard, a food commodity is more likely to be susceptible to different pest attacks than it is after harvest or during storage. During its movement from farm to the processor and through distribution channels, environmental conditions surrounding the commodity change significantly. Because of the different habitats, different species of organisms challenge the product's integrity.
(e) A compilation of the current defect action levels for natural or unavoidable defects in food for human use that present no health hazard may be obtained upon request from the Center for Food Safety and Applied Nutrition (HFS-565), Food and Drug Administration, 5100 Paint Branch Pkwy., College Park, MD 20740