No one knows exactly how many immigrants are living without legal status in the U.S. territory of Puerto Rico. Rebecca González-Ramos, ICE's top investigator on the island, estimates it's about 20,000, and since January it's been her job to track down and deport every last one of them.

"Our mandate," she said, "is 100 percent. So everybody that's in the United States, and in this case in Puerto Rico, without an immigration status, needs to be removed or deported."

González is the Special Agent in Charge of Homeland Security Investigations in Puerto Rico and the U.S. Virgin Islands. HSI is Immigration and Customs Enforcement's intelligence office – one of dozens of HSI offices nationwide. She is the first woman to lead her office, responsible for investigating customs fraud, drug and weap

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