Managers at a local store are being more cautious after they say a customer tried to pay with $140 in counterfeit money Tuesday.

Managers at Red Front supermarket called Harrisonburg Police after they say a female customer used fake $20 bills.

A store clerk noticed the bills felt a little funny, so she used a pen to check for counterfeits.

Store managers say it was clear the money was not real. They say they usually only check bills for larger amounts, but now that's going to change.

"We would just do the hundreds and fifties because that was the worst [for counterfeits]. But, now that this has come through, we will be doing all of them," says supervisor Cindy Bolton.

Bolton says this is the worst incident of its kind the store has experienced. Harrisonburg police say the investigation is being handled by the Secret Service.