This is a pretty misleading headline. He had an inconclusive test result due to a diluted sample. Now the question is, why was it diluted? Did he try to drink too much water to throw off the test because he thought he would test positive for something? Did he have food poisoning like he claims? Did he just get sponsored by Recovery Water?
There is no conclusive evidence that he had anything illicit in his system, but obviously there will be some concerns when you combine this with his altercation in the medical facility that got him sent home from the combine.