Final answer:
In Texas, the legal BAC limit for drivers under twenty-one is 0.00%. There is a zero-tolerance policy, meaning any detectable alcohol can lead to DUI charges.
Step-by-step explanation:
The legal BAC limit in the state of Texas for drivers who are under the age of twenty-one is 0.00%. In Texas, as in many other states, there is a zero-tolerance policy for underage drinking and driving.
This means that any detectable amount of alcohol in the system of an underage driver can result in a DUI charge. According to the National Minimum Drinking Age Act of 1984, all states are required to enforce a minimum drinking age of twenty-one.
The state's legal limit for adults over the age of twenty-one is a BAC of 0.08%, but for those under twenty-one, Texas law states that there should be no detectable alcohol in their system while driving.