The Oregon Department of Revenue is being questioned after a Salem woman is accused of tax fraud.  She got a $2-million refund.  Derrick Gasperini, with the Department of Revenue says the mistake was human error, and they'll start reviewing all large refunds.  State Representative Vickie Berger says they need to make sure the department is doing enough to check tax returns for fraud, because if a $2-million return can get through; how many smaller false returns are being paid at the state's expense?