First, to get it out of the way, I hate where things stand, today. Location privacy basically doesn't exist. A permanent license plate reader was just installed at an intersection bordering my neighborhood[0]. They're installed in every police cruiser, they're automatic and they flag problems/trigger being pulled over.
On three occasions, over 20 years (evenly spaced), I was pulled over for vehicle registration problems. The first, someone had scraped the tag off of my car and I was driving without tags. I showed the cop my registration/insurance and 10-60 minutes later I was on my way. The second (about 7-10 years ago) was my new motorcycle who's registration expired six months later than my cars, I rode for almost the entire summer with the wrong tabs on my car, passing several police (sometimes driving directly behind me) until I was finally pulled over. I was written the ticket because "it was six months past-due" (he waived the charge when I showed up renewed to the hearing).
The last was this year: my car was in my ex-wife's name and the registration expired in July. I still had insurance and I was aware that it was past due but couldn't resolve the problem, myself. I drive with Waze and in my area "if the cop isn't on the road driving with you" they're lit up on Waze. I avoided driving. When I had no choice, I avoided routes that showed cops and altered my route when they showed up unexpectedly[2].
This worked for two weeks after the expiration date and two days into the following month. The first time a cop ends up behind me I got pulled over[3]. The wording he chose was "Your vehicle was flagged as having expired plates" or something like that[3].
The unintentional follow-up to this, though, is that when I received my tabs it was unusually cold outside, I was running late for a date and my plate was too dirty to just "spit shine/affix" the sticker, so I put it in my winter jacket pocket and went on my way (figuring if I got pulled over, I'd show them the tab and explain my situation). I had no less than three police cars happen into range of being able to read my plate electronically or visually and not one budged. Maybe a coincidence, I thought? Perhaps they had something better to do/get to? The route to my girlfriend's house passes a police station; it's rare for me to take that route without encountering a cop on the road or in a speed trap. It's been 6 months since I put those tabs in my pocket. They're still there.
[0] Full disclosure: My information is from a neighbor mentioning it and my noticing it afterward as I drove past; I have not inspected/researched but it's not relevant as these installations are being rolled out at an increasing pace.
[1] The first was my new motorcycle which renewed on a different day than my cars and I missed it, the second was a car that was in my ex-wife's name which she failed to renew.
[2] It was a very weird place for me ... I've never had that "avoid the cops" feeling in my life. It's unnerving.
[3] The guy saw the car was in my wife's name, I said "divorce", he said he "totally understands" (and was incredibly sympathetic). He did write the ticket, but told me to ask for a hearing, show up with current registration and he'd request the ticket be invalidated. It was. I wasn't even given court fees.