Your ID from DMV

Are people naive? You go to the department of motor vehicle to get your state ID or driver's license, birth certificate, SSN, etc., what do you think is on that bar code or magnetic strip? Definitely not just your name, address, and date of birth...your history is on it!  So when you shop at a store and they ask for your ID and they scan it, that computer won't show it, how do you think you're getting stuff in the mail or junk mail in your email? SMH