Often, an officer will make a traffic stop. The officer may believe that the person is impaired, but he will not detect manifestations consistent with impairment from alcohol, or the preliminary test suggests a low alcohol content. The officer will often ask whether the person takes any prescription medications.
Unless the person takes no prescription drugs, the person's answer is fraught with peril.
First, you should never lie to an officer. Lying to an officer could get you in worse trouble than telling the truth. Most states have criminal offenses related to lying to the police.
Second, if you answer the question, the officer may decide that one or more of those prescription drugs is causing you to be impaired. The officer will arrest you for DUI and request a blood and/or urine test. The levels will be used to try to prove that you were impaired by those prescriptions. It is beyond the scope of this guide to address what levels will get yu into trouble.
So, what is the correct answer. The correct answer is to state that you do not discuss your private medical information.
This may not prevent the officer from charging you with DUI or some other offense, but it will mean that your answer will not be used to incriminate you.
Remember, you have a constitutional right to remain silent. The less you say when confronted by the police, the better.