The police can charge you for an inability to be in full control of your vehicle. You don’t have to have drugs in your system. They can do it, if you seem tired or you are emotionally tripping out.
Yes, but that’s not what he was charged with.
He was charged with offense of driving under the influence of a DRUG. Not something else.
That maybe what he says he is charged with, but I’d have to see some court documentation.
Trial by jury here, otherwise.