Final answer:
The appropriate action to take when a visibly intoxicated customer is halfway through their drink is to ask them to leave the premises for their safety and the well-being of others.
Step-by-step explanation:
When a customer who is drinking alcohol shows signs of visible intoxication and their glass is half full, the appropriate action to take is to ask them to leave the premises. This is for the safety of the intoxicated person and the well-being of other customers. Continuing to serve alcohol to someone who is already visibly intoxicated can lead to potential harm and legal issues.
It is important to prioritize the safety of all individuals involved. By asking the customer to leave, you are taking responsibility and preventing any further negative consequences. In cases like this, it is advisable to offer alternative means of transportation, such as calling a taxi or offering to help them arrange a safe ride home.