Legal Question in Consumer Law in California

Although there are always changes in the law, what mainly has changed is technology. When retailers run your checks through the cash register systems they have, it reads the magnetic routing and account numbers on the bottom of your check, and the same connection that tells if your credit or ATM card is good and has enough money available connects to your checking account runs the same process as if you had used a card. As for whether they keep your check or not I think that is a matter of what their merchant services bank requires as far as verifying transactions, keeping an audit trail, etc.