What is the legal blood alcohol concentration (BAC) limit for drivers under 21 years of age?

In Wyoming, it is illegal for a driver under 21 years of age to drive with a blood alcohol concentration (BAC) of 0.02% or above. Note: An average 180-pound man may reach a BAC above 0.02% from drinking just one 12-ounce can of beer before his body starts to break down the alcohol. Hence, for drivers under 21, a BAC limit of under 0.02% is effectively zero tolerance.