James O'Keefe always uses the same trick to get people to admit what they're doing. He pretends to be a guy with a scam to bilk money out of the taxpayers, and he runs it by an organization he suspects is aiding and abetting similar scams. He gets them talking and joshing with him. He repeats, in increasingly outrageous terms, exactly what kind of scam he's running and how it works like a charm. They laugh and agree that, yes, it works just like that, and they're totally cool with it. Hey, the money's sitting right there, who wouldn't pick it up? Ah? Ah? Usually they give him a little friendly advice about magic words to use in packaging the scam. Then he releases the video and waits for them to complain that they were taken out of context.
In his wake he probably leaves a trail of emergency meetings designed to prevent anyone from each organization from spilling the beans to any more strangers who might be carrying cameras. But he keeps moving from industry to industry, so they never see him coming. And he doesn't seem to be running out of targets.