02/04/2009 at 11:00 AM EST
Olympian Michael Phelps is getting back to work after a controversial photo was published last weekend of the swimmer apparently inhaling from a marijuana pipe
The gold medalist, 23, was spotted at a Baltimore pool Tuesday apparently for a training session, according to reports.
The reappearance follows Phelps admitting to using "bad judgment" after the U.K.'s News of the World
printed the picture. "I'm 23 years old and despite the successes I've had in the pool, I acted in a youthful and inappropriate way, not in a manner people have come to expect from me," Phelps said.
One unexpected supporter after the fallout? Ashton Kutcher
. “I simply feel that Michael Phelps is entitled to his privacy,” Kutcher wrote on his MySpace blog
. "The kid made a mistake (he is only human) and anyone who has been in the public eye knows the magnification of minor missteps can be blown way out of proportion.”
Meanwhile, Sheriff Leon Lott Jr. of Columbia, S.C., where the incident took place last November, said Tuesday in a statement
that an investigation is underway.