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No, it doesn't work like it does in a DWI with alcohol case, there is no presumptive number. It requires expert testimony but they try to get around it by using the officer to testify that you acted under the influence.
These are reasonably easy to beat if you were using prescribed drugs and hire a physician to testify it was within therapeutic limits and wouldn't be likely to influence anyone who had been taking the medication. The reason is that the blood levels don't work the same.
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Of course, please feel free to ask any follow up questions in this thread.