Hi Incho, I've certainly found I'm not at ALL a grammar geek since I've come here, because I don't do well with the types of questions you asked here, but use this as a model: The student was found to have a mouse in his pocket . Same structure, but "above the permitted level of alcohol" is replaced with the simple word mouse . That seems like an object to me.
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The driver was found to have above the permitted level of alcohol in his blood.Sorry for my butting in. I'm not a specialist, Inchoateknowledge, but I'd have thought that the part in pink is a noun phrase (the head of which is alcohol), which functions as an object of the verb