Greet all guests on arrival and departure, taking the opportunity to assess their condition.
Either don’t drink or limit your own consumption of alcohol so you can be aware of how much your guests are drinking. Being a good host requires judgment and tact, and you won't have either if you are impaired.
Don't encourage excessive drinking.
Be mindful of serving individual guests high-alcohol volume drinks (such as a Long Island Ice Tea); no more than 2 should be served to a guest.
Minor guests/spouses/dates will not be served alcohol.
Know your guests – it is much easier to track the changes in behaviour of those you know. Inviting strangers increases the risk. Guests should respect your home and other guests or they will be asked to leave.
Make every effort to keep intoxicated guests from driving, including: offering non-alcoholic beverages and snacks to encourage them to stay longer, providing alternative transportation, and arranging overnight accommodations. If an intoxicated guest insists on driving, you should notify the police.