Final answer:
The duration of license revocation for drivers under 21 convicted of driving with alcohol or drugs varies by state but often starts at a minimum of one year.
Step-by-step explanation:
If a driver who is less than 21 years old is convicted for an offense of driving with any amount of alcohol or drugs in his/her body, the consequences can be severe. Specific penalties, including the length of license revocation, vary by state, but they often align with the zero-tolerance laws established following the National Minimum Drinking Age Act of 1984. This legislation was heavily influenced by the efforts of Mothers Against Driving (MADD), which lobbied for raising the drinking age to 21 to address the problem of driving among youths. License revocation for such an offense for drivers under the age of 21 could range anywhere from a few months to several years, depending on state law and the circumstances of the offense, but it typically starts at a minimum of one year.