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The ketamine bit isn’t speculation at all, he’s publicly admitted to it and says he has a prescription. At his income bracket that basically means he wanted it, so he got it.
I agree that it’s probably not (only) ketamine giving him bloodshot eyes all the time, who knows what that is though.
That makes the one shitty English teacher I had stand out even more in my mind. She wasn’t quite Roald Dahl character level shithead, but she was close. I’m pretty sure her being ex-military had a lot to do with it.