INDIANAPOLIS (AP) – The refunding of nearly $4 million in Indiana private school voucher money to the state has raised questions about oversight of the program that now includes almost 30,000 students.

The Indiana Non-Public Education Association said in mid-December that 80 of the more than 300 private schools participating in the program made errors in calculating voucher costs over the past three years.

Republican House Education Committee Chairman Robert Behning tells The Indianapolis Star (http://indy.st/1wyqHZ9 ) that legislators should look into simpler ways to administer the voucher program.

A state Department of Education spokesman says the agency doesn't have the legal authority to audit the voucher program, which cost $81 million last year.

Democratic Rep. Greg Porter of Indianapolis says he worries the amount refunded is just the tip of the iceberg.

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Information from: The Indianapolis Star, http://www.indystar.com