The bank is located at 24 Waterbury Road in the New Haven County town of Prospect, state police said.
At about 4:40 p.m. on Monday, Nov. 15, the Prospect Police Department received a report from the manager of the Ion Bank that an individual was trying a cash a fraudulent check at the drive-up banking window, Connecticut State Police said.
The driver left the bank as staff tried to verify her identity, police said.
Police said the suspect was driving a white Subaru Forester with a registration plate that was later determined to be a misuse.
Anyone with information about the incident can contact authorities at 203-758-6609 and reference case number CFS# 2100469543
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