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Omaha, Neb. • Cammile Adams got a scare Wednesday when she was disqualified from the 200-meter butterfly after posting the fastest qualifying time in the preliminaries at the U.S. Olympic swimming trials. After a video review, the decision was overturned and she remained in the hunt for a spot on her second straight Olympic team.

A deck official initially ruled Adams was on her back instead of her stomach coming off the 150-meter wall, and she was DQ'd, which triggers an underwater review. Her time of 2 minutes, 8.29 seconds was fastest among 16 qualifiers for the evening semifinals.

"When I saw it, obviously a little bit of panic, a lot of panic," Adams said. "But just really thankful for the system we have. I got to go back to the head official and just look at the underwater camera. With it being overturned, obviously I'm very, very thankful."

David Marsh, Adams' coach, said the underwater camera showed Adams' toes off the wall with her fully on her side moving toward her stomach on the last turn of the four-lap race.

"This was a case where having more technology is the right thing to do," said Marsh, who will coach the U.S. women's team in Rio de Janeiro. "You want to give the benefit to the athlete."

Marsh described Adams as being "blown away" by the DQ.

"Cam's the kind of person who doesn't do anything wrong, much less a turn," Marsh said. "Every time she touches the wall, it's with two hands. The problem we get in here is that when the swimmers are coming through the rotation on a turn, all butterfliers who touch the wall drop the shoulder to slip under the water and then push off. So once you're under the water, it's hard to really get a clear idea of if you're really on your back side or stomach."

Adams finished fifth in the 200 fly at the London Olympics.

She planned to do some extra turns during warm-ups before the evening semis.

"I'm not worried," she said. "I'm very, very confident in what we've done this past year."

In other preliminaries, defending Olympic champion Nathan Adrian was the top qualifier in the 100 freestyle in 48.43 seconds. Also advancing to the evening semifinals was Anthony Ervin, who at 35 is the oldest man competing at trials.

Ryan Lochte qualified sixth-fastest but dropped out to get further treatment for a groin injury that has compromised his performances at trials. He is focused on making the team in the 200 individual medley, which starts Thursday. Lochte is already going to Rio de Janeiro as a relay swimmer, but he wants to swim an individual event.

Kevin Cordes was the top qualifier in the 200 breaststroke with a time of 2:08.54. He already made the team in the 100 breast.