It's no secret here in Central California that many, if not most, people who work in the fields in Valley agriculture are undocumented immigrants.
University of Denver Anthropologist Sarah Horton revealed in a study published in late June that agricultural employers often take advantage of migrants' inability to work legally by making their employment contingent upon working under the false or borrowed identity documents provided by employers.
Horton says that farm workers call this practice "working as a ghost." She says it's a way for agribusiness companies to disguise thier employment of undocumented people.
Horton also recently wrote a book on the issue as well. "They Leave Thier Kidney's in the Fields" focuses on the illneess, injury and illegality among U.S. Farmworkers.
To listen to the interview between Valley Edition Host Joe Moore and Sarah Horton click play above.