Answer: Abbreviated titles

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When is it appropriate to abbreviate titles (Mr., Dr.) and when should they be written out in full?

First, please note that a title directly precedes the person's name. Other uses are merely descriptive nouns and should always be written out.

Incorrect: Somebody ran for a Dr.
Correct: Somebody ran for a doctor.
Correct: Somebody ran for Dr. Fraiser.

Incorrect: She had the kind of glare that said butt out, Mr.
Correct: She had the kind of glare that said butt out, mister.
Correct: She had the kind of glare that said butt out, Mr. Bregman.

( Let's look at the rules for titles, with some more examples from Stargate SG-1. )