The whole thing smells bad. DHS agent who "happened" to be in the country "received a tip off"? Please.
Some DHS was just hanging out on holiday in the RD and someone took upon themselves to ring him up randomly and tell him about this supervisor having sex with local prostititutes.
OR the DHS agent was working illegally in the RD and illegally bribing prostitutes to entrap visiting Americans.
Which sounds more plausible to you?