There is no evidence the Phelps did actually participate in drug taking activities, however he has admitted that the picture is not a fake. Chances are it was a fraternal thing, Phelps goes to an American University, the fraternity is similar to a brotherhood; the photo is probably just a pose. However, he has been banned for 3 months, and has taken this without argument. Weed is not a performance enhancing drug, so no further action will be taken.
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He did took steroids and marijuana. He did not use it to make him stronger but he used it for fun he thought.
Michael Phelps claims to have given up all drugs. Note the related marijuana incident in related questions.
Yes he did. He was caught inhaling a marijuana pipe. He was suspended from competition for three months.
He took marijuana and steroids. He didn't do it so he could be a better player. He did it because he did it for fun (which wasn't)