Police say counterfeit currency is passing through one local community. Janesville police say the bills showed up in seven different spots. People either passed or tried to pass the fake money.

"Especially on Saturday or Sunday mornings, it can get super busy up there," Harvey Igo, general manager at Denny's Restaurant in Janesville, says.

"You got people lined up wanting to pay. It's hard to check."

Service so fast, phony money might pass unnoticed not once, but twice.

"Then we got another one just this last week. Last Thursday we got a counterfeit $100 bill," Igo says.

The second time it happened at 3 a.m.

"She should've been paying a lot more attention than what she did because it was pretty obvious," Igo says.

People passed the fakes $100 bills at some Janesville bars and quick marts.

Lt. Dan Davis says, "If you get them close enough, this one is undercut."

He says they appear smaller and less precise with no watermark, no security strip.

But Lt. Dan Davis says it's not how they look, rather how they feel.

"When you handle them, the texture feels to me like plain paper," he says.

Davis says the five bills carry two different serial numbers.

"If it was same person they could've scanned two different bills, could be two different places. It's difficult to say," he says.

General Manager Harvey Igo says the ordeal is difficult to take.

"They're watching for all bills, not just 20s or 100s, everything now."

And, he's armed employees with a tool.

"If you take the counterfeit detection pens, it's pretty obvious," Igo says.

Police say they have identified people who passed the bills, but the investigation is not finished yet.

Igo says, "But they can come back and try it again because we're ready for them now."

Police recommend anyone who is suspicious of a bill either to refuse it or notify investigators.