State of California travel restrictions The problem with California legislating this stuff is that it never ends. Regardless of how you feel about this particular issue, it's not illegal to prohibit it in Iowa. If the SCOTUS were to weigh in, like they did on Gay Marriage and DOMA, that would be different. CA could ban travel to a state that doesn't sign on to some sort of global warning legislation. I'm liberal leaning, I just think they are overreaching on these travel bans.