What is an important step to ensure that duty of care obligations in the context of alcohol sales and services are met?

Question: What is an important step to ensure that duty of care obligations in the context of alcohol sales and services are met?
  a note of any medical alert jewelry, such as a diabetic bracelet
  provide a copy of the house policy to customers as they arrive at the establishment
  have photographs of previously ejected patrons in a place where all staff has quick access
  take steps so that if patrons become intoxicated, they do not pose a threat to other patrons or the public

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take steps so that if patrons become intoxicated, they do not pose a threat to other patrons or the public