Uber and Mothers Against Drunk Driving last week put out a report suggesting Uber helped reduced drunk-driving accidents. However, the claim gets a little wobbly when you take a closer look at the numbers, as ProPublica just did. Now MADD is backing away from the assertion, claiming the relationship is "purely correlational." Meanwhile, it turns out Uber started donating money to MADD last summer. Surely that is unrelated, right?