A new federal report says the use of scanners in grocery stores is still a long ways from perfect. The Federal Trade Commission study says for every 33 items run through a scanner, one of them will ring up at the wrong price. Jerry Fleagle, president of the Iowa Grocery Industry Association, says errors sometimes occur when an A federal report finds those bar code scanning machines in grocery stores are item was just put on sale or a sale just ended. He says scanners don’t make the mistakes, it’s whoever programs them daily at the store.Fleagle says a survey of Iowa grocery stores done by the state Attorney General’s office found scanners were accurate 95-percent of the time. Fleagle says customers should keep a close eye on the cash register readout as items are being rung up and then review the receipt afterward.Fleagle says stores should refund the difference when a scanner overcharges and some stores will even give that item away.