I had a DUI 20 years ago. Where can I find this?

I had a DUI with a hit and run 20 years ago. It was plead down to a misdemeanor. Last week I was at my new job. Human Resources said that it's still on my record. Where can I find this? I would like to know where I can find this information about myself so that I can correct things if I can, and so that I can answer job interview questions appropriately. My new job is angry because they think I lied - I didn't know this was on my record. Please help!
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