Liability Issues Both your guests and you can be liable for what happens after they leave your party. Nothing can add to that liability, but you can take additional steps to reduce that liability by having an Alcohol Alert machine available for them. Alcohol Alert helps protect you because it’s a self administered test and can only be used as a screening device. It protects your guest because the machine never says it’s OK to drive, it just indicates BAC levels and warns against driving as the levels increase toward the legal limit of .08%. The results of the self-test can not be used in court because admissible tests must be administered by a trained expert. In addition, there must be a printout of the test results, and the test must be conducted on a state certified machine. You and the servers can use the result of an Alcohol Alert test as the reason to stop serving a guest when necessary. Having an Alcohol Alert machine available shows your concern for their safety and well being.