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. High protein and carbohydrate foods, like cheese and meats are especially good. 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. Do not force drinks on your guests or rush to refill their glasses when empty. Some guests may not wish to appear rude and will accept drinks they do not want. Stop serving alcohol about two hours before the party is over.