Thank you for all of the information and your question. Although in general you summarized the law of DUI and the difference between alcohol and drugs in blood work and urine test fairly accurately, there is one issue that you are assuming. That is that just because an officer can or will testify that they saw an indicia of impairment, that the driver will then automatically just be convicted of DUI. That is just not the case. Although it is some evidence what the officer saw, the rest of the evidence is also considered by the trier of fact, including the defendant's testimony (if they testify), the drug results and the testimony of expert witnesses about whether in the driver's specific case that amount of drugs would have resulted in them being impaired, and any other evidence related to the incident. So, it is wrong to assume that there would be a conviction just because the officer says something. In fact, with a good DUI attorney it could be fairly simple to build a defense unless there was overwhelming evidence of the driver being under the influence or impaired.
As for lying about taking medication, there is no need to lie, and you really shouldn't if you are mandated by probation to take the medication. The fact is you don't have to, and shouldn't make a statement at all. Period, no statement. You simply say that you are invoking your right to remain silent. Even if you didn't do that, lying would be the biggest mistake you could make because the State will find out your lying and they can use the fact that you lied to impeach your testimony about not being impaired or under the influence. In addition, of course, you might have issues with your probation. Again, no need to make any statement at all about drug or alcohol use and last thing you want to do is lie since they will find out anyway.
Let me know if you need any clarification. I would be glad to assist you further if I can.
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