I know its normal to get asked for license, registration, and proof of insurance. But why ask for the registration? When I register every year, the county sends me a sticker with the plate number and expiration date to stick on the lic plate. The cops van see the plate and date right? Plus I’m sure they run the plate when they pull you over anyway. Seems to me they already know the registration status.
So why do they still ask for the registration paper?
It’s also a chance for cops to look in the glove box, where most people keep their registration. Or to smoke out people who stole a car and thus don’t know precisely where the registration is.
But those are ancillary reasons for cops asking about registration. I figured OP only wanted the bona fide, entirely-defensible reasons.