Eleven Secret Service agents were recalled from Colombia last week and have been stripped of their security clearances after reports emerged alleging that some of them had taken prostitutes to their hotel rooms before President Barack Obama arrived for the Latin American summit.
The U.S. official said the agents had been "offered" the opportunity to submit to polygraph tests and that some had accepted. The official didn't say how many had agreed.
Ed Donovan, a spokesman for the Secret Service, wouldn't confirm the information, saying only that the agency's Office of Professional Responsibility was using every investigative tool at its disposal.
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