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Question:

If a Louisiana driver who is under the age of 21 is found to have a blood alcohol concentration (BAC) of ______ or above, his or her license will be suspended for 180 days.

A 0.02%
Explaination

If a Louisiana driver under 21 years of age is found to have a BAC of 0.02% or above, his or her license will be suspended for 180 days. 0.02% is the smallest amount that is detectable by today's most commonly used chemical tests. [Administrative Per Se (Submit or Refuse Alcohol Analysis Test), Chapter 9: Driving Offenses, Louisiana Class D & E Driver's Guide]