Eugene Volokh is the Thomas M. Siebel Senior Fellow at the Hoover Institution at Stanford, and the Gary T. Schwartz Distinguished Professor of Law Emeritus and Distinguished Research Professor at UCLA School of Law. Naturally, his posts here (like the opinions of the other bloggers) are his own, and not endorsed by any institution.
California Law Stops City from Flying World Flag Above U.S. and California Flag
And the U.S. Constitution doesn't preclude this result.