This!!!!
When you use a plate reader in conjunction with some sort of database, it makes scrubbing for the repeat car very easy!
Unless you live on a street that sees like 5 vehicles per day, most are not going to watch how ever many weeks of video or pictures you have to see if that vehicle came by before. It is just way to time consuming.
I use this
utility that a member here created. I now have 3 years of plate history.
When something happens I can know in seconds if that vehicle has been back here before.
I get an email every day that gives me a list of first-time plates that come thru.
I tag neighbor plates and suspicious plates, along with FedEx, UPS, etc. so I can jump in this utility in the morning and do a quick look and see did any vehicles come past that don't belong back here.
I get a phone alert when a car I marked as suspicious comes thru. When I am expecting a package, I can put an alert on that delivery vehicle.
Now that will be different for everybody. If you live on a main road or connector road, you will have more traffic so you may get a lot of first-time plates.
I live in a no-outlet subdivision, so someone back here at 2am should be a neighbor.
So when I see a car come thru that I haven't tagged, I see if they came thru before.
And you learn how many cars actually go past you. My subdivision if 40ish homes. In three years, I have collected over 20,000 unique plates. That is crazy.