Setting clear house policies (such as carding everyone) is valuable because it:

Setting clear house policies — like carding every customer or limiting drink service — is valuable because it gives staff consistent, easy-to-apply standards, reduces ambiguity in difficult moments, and lowers the establishment's overall risk of violations and liability. Written, well-communicated policies also support staff if a refusal is challenged and demonstrate the establishment's commitment to responsible service. Managers are responsible for establishing, communicating, and enforcing these policies. Consistency across all staff is one of the strongest protections an establishment can build.