[mixmastamyk]

Neither should be necessary. Cops can check registration electronically already by scanner.

[ryantgtg]

Sure but it’s probably simpler for parking enforcement and cops to just look at the color of the sticker to see if it’s out of date.

Stickers are also useful so that I know which neighbor to shake my head at as I pass by (as long as they don’t see me).

[mixmastamyk]

It’s not simpler… probably still cheaper. There’s also the month and whether it was stolen from/to etc. Most accurate record is DMV database.

[ryantgtg]

No, it is simpler to drive down a block and within 8 seconds the cop has viewed the colors of 15 parked cars on that block vs scanning those plates.