I am notoriously forgetful about putting the sticker on my plate. I always renew on time, but even now my registration sticker is shoved in my glove box, even though I've had it for two months. I'll use this as a reminder to go stick it on today...probably. I usually only think about it when there is a cop behind me. But they've never pulled me over for it. I figured it was because they could see I was registered when they run the plate, and have better things to do with their time.