Some funny money has been showing up around Green Country.
But, business owners aren't laughing.
Police in Owasso, Mannford and Sand Springs all are investigating cases of counterfeit cash.
"We have received $5, $20, $10 and $50," Carnie Low has owned a convenient store in Tulsa for about three years.
Last year, she saw a handful of counterfeit cash come through her business.
Low's clerks are now specifically looking for funny money, "Most of the time we try to use the counterfeit detector pen."
Assistant Police Chief Mike Carter says the latest case showed up at a Sonic Drive-In in Sand Springs.
The lady got away without being seen by security cameras.
Assistant Chief Carter says the suspects aren't always who you think they are, "A lot of them are [high school] students that try to see if they can get into this and make it work."
Assistant Chief Carter says these days, there's a way criminals are getting the same feel of a buck.
They're bleaching the color on the real deal.
"They'll take a lower denomination bill and then they'll try to print back over it with a larger denomination bill," Assistant Chief Carter said.
What crooks can't do is replace the embedded thread which states the actual amount and you can't copy color-shifting ink or the water marks.
But, Assistant Chief Carter says sometimes the bill doesn't even have to look real, "We've had a $300 bill passed with Bill Clinton's face on it and the clerk gave change."
Investigators are trying to figure out if the three recent cases are connected.
