Unfortunately, improperly adjusted headlights would provide a legitimate basis to stop your brother. Once he had him pulled over, if he smelled the odor of alcohol, that would provide the probably cause to proceed to the evidence needed to charge the DUI.
Yes that is a valid reason for the officer to pull him over. be usre he requests a DMV hearing within 10 days from the arrest date. It is seperate from the court case.
Unfortunately, it is a valid stop. As nonsensical as it sounds, faulty equipment is a basis for a traffic stop. The biggest concern that your brother should have is that he is a under age (im assuming under 21) which will get him a mandatory license suspension for 1 year and a host of other penalties. California has a zero tolerance policy for minors and DUI. If your brother would like to discuss this further, I provide free initial consulations.
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