Drive to CA for a visit Rocketman. You must pass through a checkpoint to enter the state. Though on I-5 from your direction it's several miles inside the state line.
But isn't it already a law that you must have identification and be able to prove who you are, at all times?
Yep, been through the CA checkpoints before, though it was many years ago. Made a few trips down that way when we were just cutting the NE corner on the way over to NV, and IIRC, the checkpoints were closed on a couple of those occasions.
Regarding being required to have ID on you at all times, there was a dustup about that in NV a number of years ago. Discussed here on APS, too, but likely buried way back in the archives.
I routinely go about here without ID, usually when the wifey-poo are out walking or riding our bikes. There is no requirement to the best of my knowledge. It wouldn't surprise me if a young copper were to get testy about it, though, if we were stopped for some reason.