here is a detailed example of a policy you are  seeking
_http://www.museumpests.net/resources/referencedocs/06%20NMAI_final_food_polic
y.pdf_ 
(http://www.museumpests.net/resources/referencedocs/06%20NMAI_final_food_policy.pdf) 
 
Found by a web search using the terms
museum food policy
 
there are other examples online
Best wishes, Barbara Hass, retired  librarian
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