Final answer:
The policy is most likely related to the Jewish dietary law of kashrut, which prohibits mixing kosher and non-kosher foods. This ensures that only kosher foods are being served in the facility and maintains the dietary restrictions of the Orthodox Jewish community.
Step-by-step explanation:
The policy of not allowing employees of a congregate feeding program serving an Orthodox Jewish community to bring food items into the facility is most likely related to the Jewish dietary law that states that kosher foods should not be allowed to mix with non-kosher foods. This is known as kashrut. According to this dietary law, pork and shellfish are not allowed in a kosher kitchen. Therefore, the policy is in place to ensure that only kosher foods are being served in the facility and to maintain the dietary restrictions of the Orthodox Jewish community.