>> police tell us the customer, 25-year-old bernardo gray bought 3 cars with bogus cards. we talked with workers at one. >> he took his card and we ran it, swiped it and he put in what we thought was a pin, the card came back with approval. >> it got police involved but gray called back a couple days ago asking for his money back. >> absolutely threatened to call channel 9 and expose us, to say we were doing things, taking his money. >> gray is not in custody. police tell us warrants for his arrest were signed yesterday. ace auto says they became suspicious and called to get police involved. allison? >> blake, you found out the suspect isn't a stranger to law enforcement? >> reporter: in fact, we checked florida court records and they show 2013 he served prison time for a conviction on fraud, a giving false information to a pawnbroker. live in east charlotte, blake news. >>> we are following breaking major news, late this afternoon, local health officials confirmed they are now monitoring 8 potential cases of the mumps virus in our area. >> in the last hour we told you abo