What is the statute of limitation on collections for a bank account overdraft?

Question Details:

I just received a call from a collections agent regarding a bank overdraft 7 years ago. I thought I paid it back 5 years ago when I was being investigated for security clearance and needed to resolve all bad debt prior to being given a clearance. I went back in my records and cannot find any correspondence or records of this debt on past credit reports. Has this debt passed its time limitations and what legal recourse is there if I cannot find any documentation?

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