COLUMBIA, S.C. - South Carolina authorities in the county where Michael Phelps was spotted smoking from a marijuana pipe say they are considering a criminal charge against the Olympic superstar.  Lt. Chris Cowan said Tuesday that Richland County sheriff's investigators are gathering more information about the photo, which showed the swimmer inhaling from a marijuana pipe.  Cowan did not specify what charge was being considered and declined to discuss details of the investigation.  The photograph was first shown in a British tabloid Sunday. News of the World said the picture was taken during a November house party while Phelps was visiting the University of South Carolina.  Phelps and his advisers did not dispute the photo's authenticity. He has issued a public apology.