This also seems very pertinent:

The questioners at Fort Hunt, Va., “had graduate degrees in law and philosophy, spoke the language flawlessly,”
Do current interrogators have qualifications approaching these? I honestly have no idea, but I would suspect not. That's a rare combination, and necessarily expensive. Also I expect people holding these kind of credentials today would be less inclined, on average, to volunteer for this sort of work than those from the 40's.