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From TMZ:
"Our sources tell us ... Phelps was pulled over around 1:40 AM in his white Range Rover. We're told he bombed his field sobriety test ... and his B.A.C. was almost twice the legal limit.
"Officials just issued a statement saying Phelps was initially pulled over for going 84 in a 45 ... and during the stop, the officer noticed he was hammered."
The 29-year-old swimmer is in the middle of a comeback after retiring at the 2012 Olympics.
Phelps was arrested for DUI in 2004 and received 18 months probation.
"Last week, I made a mistake. Getting in a car with anything to drink is wrong, dangerous and unacceptable. I'm 19 but was taught no matter how old you are, you should always take responsibility for your actions, which I will do," he said at the time.