COLUMBUS, Ohio (AP) — A candidate for state treasurer says the current office holder should examine the impact of private prisons on Ohio taxpayers.

Democrat Rob Richardson in a letter Wednesday asked Republican State Treasurer Josh Mandel (man-DEHL') to study the issue.

Richardson is an attorney and former University of Cincinnati board chairman. Richardson says he has a deep "personal concern" over Ohio's high incarceration rates.

He says Ohioans deserve to know how much tax money is being paid to operators of private prisons. Richardson says some of that money would be better spent on education and affordable health care.

A spokeswoman for Mandel's office didn't return a message seeking comment.