BIG STONE COUNTY, Minn. (FOX 9) - Authorities in Big Stone County are warning about counterfeit $50 bills being passed in the area.

Counterfeit $50 bills

What we know:

The Big Stone County Sheriff's Office says there have been several reports of fake $50 bills at local businesses.

The fake bills have the same serial numbers and a lighter blue color to the left of President Ulysses Grant. The texture of these bills is noticeably different from real bills.

Authorities say that the counterfeit bills also have a red mark on the back, specifically on the Capitol Building, which may be from a counterfeit pen used on the original bill that was copied.

What you can do:

Businesses are encouraged to use counterfeit money detector pens to help identify fake bills.

What we don't know:

The

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