Where does it say getting "HIGH" is illegal?

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PLEASE READ THIS ARTICAL FIRST: http://news.yahoo.com/s/ap/toad_smoking;_ylt=Ao7q73HFnTmcqsI791FqfpvtiBIF Ok so not saying that I want to go and do smoke a toad but really where does it say that getting "High" is illegal? I understand that our government does not want people to get high. Some people will do just about any thing to get high just like the guy in the article using a TOAD to get high. GROSS! In this article it says: "It's sort of a New Age way to get high. You convince yourself it is OK because it is something you get naturally from our environment. "There are a lot of things that are created naturally but they are still not legal," he said. Where does it say that it’s NOT legal?