Secret Service investigators never formally questioned a senior agent who co-workers say was implicated in a Colombian prostitution scandal that ensnared a dozen other agents.

A high-level special agent, who was later promoted, played a key role in advance work on the trip to Cartagena that became notorious when reports surfaced that agents had hired prostitutes there.

Co-workers believe that the agent should have been included in the Secret Service’s review of the matter, but when he wasn’t, at least one filed a complaint about him with the Department of Homeland Security’s inspector general.

One reason why the agent may not have been investigated at first: location.

While hotel records indicated that women visited multiple agents’ rooms at the Hotel Caribe and the Hilton Cartagena, the senior agent’s alleged encounter occurred at the apartment of a DEA agent stationed in Cartagena, three sources familiar with the investigations said.

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