Final answer:
Legally and ethically, it is not advisable to serve an intoxicated guest more alcohol, even if they say they have a ride home. Public safety and laws such as dram shop acts must guide the server's actions.
Step-by-step explanation:
When a guest appears to be intoxicated and requests another cocktail, it's crucial to approach this situation with responsibility and legal considerations in mind. Although the guest has stated they have a ride home, it is generally against the law to serve alcohol to someone who is already intoxicated. In many jurisdictions, there are "dram shop" laws which can hold the server and the establishment accountable should the intoxicated individual cause harm to themselves or others. It's important to prioritize public safety and to prevent further intoxication, which might lead to impaired judgement or motor skills. In this scenario, the person should not be served additional alcoholic beverages and alternatives such as water or non-alcoholic drinks should be offered.