The FBI has closed its investigation into South Dakota's investment-for-visa program and the U.S. Attorney's office has decided not to pursue prosecution.

FBI spokesman Kyle Loven says the agency recently forwarded its findings of the state's EB-5 program to the office of U.S. Attorney Randy Seiler. Loven says the office decided not to bring charges.

South Dakota was one of the pioneers of the program that recruits wealthy immigrant investors for projects in exchange for green cards.

The program faced scrutiny in 2013 after former Governor's Office of Economic Development secretary Richard Benda committed suicide as state officials prepared felony theft charges against him for alleged financial misconduct.

It became a contentious issue in the 2014 campaign for U.S. Senate. Seiler's office didn't immediately return a request for comment.

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