For example:

Detective Jones

I think the D in Detective Jones should always be capitalized, because I believe that is the norm.

But what if, after introducing Detective Jones, I later refer to him as The Detective. For example:

Detective Jones asked me a few question, which I answered. After listening carefully and taking notes, the Detective then came back to me with some more questions.

I think you would capitalize the D, because "the Detective" is being used as a shorthand for "Detective Jones". But it looks a little odd, so I am not sure.

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