Isn’t this against the US constitution? Razor wire along the state border and checkpoints on roads that cross the state border are kind of nuts. I read a comment joking that the wire and road checkpoints were to keep Texan women from escaping to New Mexico, which got a bitter laugh out of me.
It depends on what the checkpoints are and if they are a drag on interstate commerce. For a while, California had staffed border checkpoints to look for produce that could bring pathogens to the state.
The Commerce Clause isn’t absolute.