Theranos fell apart the second they signed a deal with Walgreens and it became obvious they were using machines made by other vendors to do blood tests, because

Theranos fell apart the second they signed a deal with Walgreens and it became obvious they were using machines made by other vendors to do blood tests, because their own thing didn't work. Enron got away with as much as they did because of the far more generous accounting rules that were in play back then.