What is most critical to the success of an establishment's efforts to provide responsible beverage service?

★ Q: What is most critical to the success of an establishment's efforts to provide responsible beverage service?
What is most critical to the success of an establishment efforts to provide responsible beverage service?
  a written house policy implemented and enforced by all staff
  a visible and engaged shift supervisor or manager on the floor
  free or discounted food items for guests that do not consume alcohol
  a direct line and a house account and/or vouchers with a taxi company

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a written house policy implemented and enforced by all staff