Rectification: Unfortunately, even if a drug you were taking was prescribed, you may still face trouble. If it caused you to be impaired, it will still count as impaired driving and carry equally harsh penalties. Additionally, Marin County has been seeking these kinds of cases much more frequently as well, meaning that if you are on prescription drugs, it is in your best interest not to disclose that information to the officer. The Marin County DA may consider a reduced charge in some prescription drug cases.