Errol Morris, Andrew Jarecki on Documentary Faces – NYTimes.com

IN 2002, while he was making “Capturing the Friedmans,” his investigation of a notorious child-abuse prosecution on Long Island, the director Andrew Jarecki received a piece of documentary wisdom. “When this is over,” Sheila Nevins, the president of HBO Documentary Films, told him, “you will have had one of the most amazing experiences of your life. You’ll understand your subjects in a way you don’t understand your own family.

“And when the movie comes out, you’ll never talk to them again.”