In Arizona, any trace of alcohol or drugs in the system of a driver under the age of 21, no matter how small, will result in a driver's license suspension of

If an Arizona driver under the age of 21 is found to have any trace of alcohol or drugs in his or her system while operating a motor vehicle, his or her license will be suspended for two years. [Use of Alcohol and Other Drugs, Section 5, Arizona Driver License Manual]