When your guests arrive, collect their car keys. That way, when they are ready to leave, they must get a second opinion on whether they're sober enough to drive home. Always serve food with alcohol, such as high protein and carbohydrate foods like cheese and meats. They stay in the stomach much longer, which slows the rate at which the body absorbs alcohol.
Guests are less likely to drink excessively when standard measures are used.
If you serve alcoholic punch, use a non-carbonated base such as fruit juice. The body absorbs alcohol faster when mixed with carbonation. Serve non-alcoholic beverages. It's possible that some guests will not want to drink alcohol. Do not force drinks on your guests or rush to refill their glasses when empty.