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DENVER — Counterfeit cash is nothing new to local businesses, but many fake bills have been showing up around downtown Denver recently.

Business owners and employees are taking action to prevent themselves against scammers.

“We did have quite a few, like maybe three or four in a row in a short period of time,” said Nancy Cain, general manager of Meininger’s Art Materials.

Cain trains her staff on how to spot a fake.

“We actually have a little machine. If you put the bill in it, it has a light and a black light on it to show you all the watermarks,” Cain said.

The Broadway business has seen many fakes over the years. It has confiscated and scanned all counterfeit bills for police records.

Cain said it has even see customers coming to the store to buy supplies in order to make their own fake money.

Not far from the store, Subway restaurant has changed its policy on cash to safeguard themselves. It will no longer accept anything larger than a $20 bill.

“Well now we are just looking for the watermarks. They’re pretty obvious when you see them, if you haven’t checked them out,” said Amanda Ball, a bartender at Don’s Tavern.

Don’s Tavern in Capitol Hill got duped for a fake $100 bill several weeks ago.

“Even people who aren’t going out to scam may not even know that they have a fake,” Ball said.

Ball said the staff will check every large bill for watermarks thoroughly.

“We hold onto it, it’s stapled behind the bar so if there’s any question. It feels different so if you ever have a feeling you can just touch it,” Ball said.