How does a supervisor in a prison address an inmate? For example, a relative came to visit one of the inmates, so the supervisor is going to the cell (where many inmates are) and is about to call on that inmate. How would he address him then? It seems quite unlikely to me that the supervisor would address an inmate as "Mr. (Last name)"
closed as not constructive by simchona♦, Matt Эллен, JSBձոգչ, Daniel δ, Mitch Feb 22 '12 at 16:11
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I have never been in a prison, but in fiction, guards generally address inmates by their last names, without honorific: Johnson, you have a visitor. In a more formal situation, full names without honorific might be used: Michael Leroy Johnson, you are hereby released from the custody of this prison. An especially cold guard or warden might use the inmate's number: Hey 24601, get back to work.
Last name is usual. An announcement where the supervisor does not necessarily know that last name will be specific enough may be of the form first name, last name; last name, first name; or last name, first initial. "Mr. Last Name" would pretty much only be used to put the inmate on notice that this is a particularly formal, and therefore particularly threatening, interaction. Identification numbers are almost never used.
Also note that in the United States, the preferred term for someone in the supervisory role you describe is "corrections officer", or CO ("see-oh") for short; inmates who are not specifically trying to be unpleasant will usually use the term CO. Corrections officers look down on the concept of being a "guard" as a sort of low-rent, mindless warehousing function, whereas the job they do is felt to be considerably more demanding. They do not like to be called guards.