Detectives watched the Orlando couple transport multiple women with suitcases to and from the spa, "for the purpose of sexual servitude," according to her arrest warrant.
Police said victims, identified in court records as Jane Does, lived inside the spas and worked as prostitutes. Some stayed for days, others for months.
None were allowed to leave on their own. They did not have their own vehicles and generally spoke Mandarin or Cantonese, not English.
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Currey said many came from China on temporary work visas, indebted to the the brokers who helped them reach America, but believing legitimate jobs awaited them.
"Some of them are trying to make a better life for themselves," he said. "These people truly are stuck." They were shamed, intimidated and taught not to speak to law enforcement or immigration officials.
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Others answered what they thought were legitimate ads for masseuse jobs, but soon were pressured into doing more. Zullo also was seen transporting women between the Vero Beach and Sebastian spas and to various other locations, including the Orlando International Airport, according to his arrest warrant.