In many states a social host—including the guest’s employer—who does not charge an adult guest—18 years or older in some states and 21 years or older in other states—for alcoholic drinks and who does not serve the beverages under the authority of a license or permit—is not liable for the guest’s actions or injuries to himself or others.

But in most states an adult social host is liable for personal injuries and property damage caused by a minor to whom the social host provides or furnishes alcoholic beverages—especially if the social host knew or should have known the minor would drive a motor vehicle under the influence or if the minor was obviously intoxicated when the social host provided or furnished alcoholic beverages.

Laws regarding social host liability vary from state to state and are usually located in a state’s statutes.

In Montana, social host liability is limited compared to some other states. Under Montana law, a social host who provides alcohol to an adult guest (someone over the age of 21) without charge and not under the authority of a license or permit is generally not liable for the actions of that guest once they leave the premises. This means that if an adult guest becomes intoxicated and subsequently causes injury or property damage, the social host typically would not be held responsible. However, the situation is different when it comes to minors. If a social host knowingly provides or furnishes alcohol to a minor (someone under the age of 21), they can be held liable for any resulting damages or injuries caused by the minor, particularly if the minor drives under the influence or was obviously intoxicated when provided with alcohol. It's important to note that these laws can be subject to change and may vary in interpretation by courts, so it is advisable to consult with an attorney for the most current and applicable legal advice.