The Secret Service agent at the center of the Colombia prostitution scandal has been identified as Arthur Huntington, sources with knowledge of the investigation told CNN on Friday.

According to the sources, Huntington was the agent in a seventh-floor hotel room in Cartagena who had a dispute over pay with an escort.

CNN also learned that Huntington has left the Secret Service, but it was not clear under what circumstances, according to CNN's Drew Griffin.

According to sources, the alleged prostitutes -- the youngest of whom were in their early 20s -- signed in at Hotel Caribe.

One of these women, Dania Suarez, allegedly was later involved in a dispute about how much she was to be paid for the night, which brought the entire incident to light. Suarez, 24, through a statement credited to her attorney, said she was an escort, not a prostitute.

At least three agents assigned to rooms on the seventh floor left Cartagena early, according to hotel records. Two agents have been cleared to return to work, according to sources with knowledge of the investigation.

Monday, a man who identified himself as Arthur Huntington declined comment to a CNN producer. Thursday, someone at his residence closed the door and made no comment. No one answered the door Friday or responded to phone calls. The residence was just listed for sale this week.

Huntington, 41, is married and the father of two boys, according to neighbors.

A woman who identified herself as a family friend called the situation "heartbreaking."

"I know him and his character," she said of Huntington. "I would question the allegations."

Also Friday, the Secret Service distributed new rules for its agents on assignment intended to prevent a repeat of such alleged misconduct, according to two government sources familiar with the resulting investigation.

Called Enhanced Standards of Conduct, the new guidelines given to all Secret Service personnel make clear that standards of behavior required in the United States apply on missions abroad, the sources said.

Effective immediately, the new standards require detailed briefings before each trip that will include safety precautions and any necessary designations of establishments and areas that are "off limits" for Secret Service personnel, the sources said.

Also in the new standards, foreigners are banned from Secret Service hotel rooms at all times, except for hotel staff and host nation law enforcement and government officials on official business, according to the officials, and all Secret Service personnel are prohibited from going to a "non-reputable establishment."

The new standards specify that U.S. laws apply to Secret Service personnel when traveling, rendering invalid the excuse that specific activity is legal in the foreign country, the officials said.

In addition, the new guidelines allow moderate alcohol consumption when off duty, but prohibit alcohol consumption within 10 hours of reporting for duty or at any time when at the hotel where the protected official is staying, the officials explained.

An additional supervisor from the Office of Professional Responsibility will now accompany the "jump teams" that bring vehicles for motorcades and other transportation, the officials said. Agents involved in the Colombia incident were part of such a jump team.

First word of the new regulations came Thursday night, when Democratic Rep. Sheila Jackson Lee of Texas outlined them on CNN's "Erin Burnett OutFront" after meeting with Secret Service Director Mark Sullivan about the scandal that has embarrassed the 147-year-old agency and raised questions about possible security breaches.

Allegations of further transgressions by agents have emerged after the initial reports of heavy drinking and consorting with prostitutes this month before President Barack Obama arrived in Cartagena for the Summit of the Americas.

New claims include an account from El Salvador described by CNN affiliate Seattle TV station KIRO as very similar to the Colombia scandal, involving members of the Secret Service and other government agencies.

A U.S. government official, speaking on condition of not being identified, acknowledged there had been missteps among Secret Service members. Such problems are to be expected over the agency's long history and don't necessarily reflect a systemic or cultural issue, the official said.

"We have had employees that have engaged in misconduct," the official said. "People make mistakes."

Meanwhile, a congressional source said Thursday that reports of other incidents involving members of the agency, which is charged with protecting the president and other top officials as well as investigating criminal activity, have been brought to the attention of Congress.

That includes the alleged incident in El Salvador, which the Secret Service has told Congress it is looking into as well, according to the congressional source.

The KIRO report cited an unnamed U.S. government contractor who worked extensively with the Secret Service advance team in San Salvador before Obama's trip there in March 2011.