Firstly, the article is not at all implying that Pence was impaired by her prescription medication, but I agree the part about her prescription medication should not have been mentioned at all since she was sober and unaffected by anything.
Secondly, it's a mistake to believe the officer's arrest report in the first place. There is no evidence that she was "crossing over the lanes several times", which is also why her case was dropped. American police routinely lie in their official arrest reports, it might actually even be policy in many places.
iirc it's also only helpful if you're already deficient in vitamin A, which the majority of Americans aren't. It's the same thing with Ivermectin: it looked like it was helpful for covid in aggregate, but only in developing countries where parasites are common. So, treating someone's parasites with a horse dewormer made the person healthier overall and meant their immune system could commit more resources to fighting covid, but someone without parasites (meaning the majority of Americans) would get absolutely no benefit.