Texas Alcohol Serving Question?

What are the legalities of serving full bottles of alcohol such as a bottle of Grey Goose? To my knowledge it would be illegal, but I cannot find any information on the TABC's website. Any help would be helpful, as a friend of mine is doing this at his bar and I don't want him to get in any trouble. He doesn't know how to run a bar, and I'm just trying to get a clear answer.