There are a number of different methods that can be used to provide the service, these include checking different databases with negative or account history, checking that routing and account numbers are valid using algorithms, or contacting the bank that issued the check to get confirmation about the account status. As well as the banks themselves, there are a number of third party companies in the US that provide check verification services. The account history database offers a database with historical data on the account itself, and not just the person writing the check. This type of system keeps records of the account number for all checks that don't clear and can tell if that particular checking account has had returns in the past.
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