Anyone know about interrogation??

I'm just wondering if interrogators have a nickname for what they call the people they interrogate. Perhaps something they use when they're talking to other interrogators? ao lot nu triumph quan lot nu binh sua so sinh vay lien cong so quan ao ban buon chup anh cho be dep re

The CIA or Military terminology would be great, but honestly I'd love to know all the terms just in case one fits better for the background of the interrogator.

I'm looking for a term that a ex interrogator, someone trained by army, FBI, CIA, MI6 (some other acronymed branch of the government - any government, doesn't have to be USA) would use.

In my book the guy has flipped sides. He teaches terrorists counter-interrogation techniques. I want the MC to get a glimpse of the fact that this guy has a background based on the language he uses to describe the people he interrogates.

A term or expression, something like how a con man might use "a mark" to describe their next victim.