Amber R. Cook allegedly used fake $100 bills to buy a prepaid $400 gift card around 4:15 a.m. Wednesday at a Safeway store on South McDowell Blvd, Petaluma police said.
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Then on Thursday, around 2 a.m., Cook allegedly bought another $500 Visa gift card with counterfeit $100s at the same store.
After the second purchase, a store staffer was able to give police a description of Cook's car and where she was headed.
An officer pulled her over and the store employee identified Cook as the suspect, police said.
Cook, a resident of Somerset in El Dorado County, was arrested and booked at Sonoma County Jail.
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While she was being booked, officers found suspected narcotics hidden in her bra, police said.
Two other stores in the area have recently reported cases of a woman passing counterfeit $100 bills and authorities are investigating.
Anyone who has information on similar incidents is asked to contact the Petaluma Police Department at 707-778-4372.
ABC7 News contributed to this report.