In Michigan, there is a zero tolerance law that applies to motorists under the age of 21. If you are under the age of 21 and have been convicted of a DUI, call a Michigan DUI attorney right away to protect your rights. The regular drinking and driving laws do not apply because they are not even of legal age to drink yet, let alone drink and drive. All 49 other states also have a very similar zero tolerance policy when it comes to underage drinking and driving. Studies indicate that most drinking and driving accidents occur when younger motorists are behind the wheel. Zero tolerance policies make it a criminal DUI offense for drivers under 21 containing any level of alcohol in their system. The actual threshold BAC differs from state to state because the accuracy of breathalyzers is not perfect. The legal BAC content under a zero tolerance law will be between 0 and .02.