In Idaho, you are considered legally intoxicated if you are under the age of 21 and have a minimum blood alcohol content (BAC) of:

In Idaho, a person who is below the legal drinking age of 21 is deemed to be legally intoxicated if their blood alcohol content (BAC) is 0.02 percent or higher. A person who is age 21 or older is deemed to be legally intoxicated if their BAC is 0.08 percent or higher. It is both illegal and dangerous to operate a motor vehicle while intoxicated.