My wife asked me this just this week! I said that it would depend on how far the vampire is ‘removed’ from vampires “tradition”. As in, if they were a more recent conversion, maybe more archaic methods like legalistic language wouldn’t be enough and a vampire cop could enter with just a warrant. But I think an older vampire-cop who would be more bound by whatever lore suits the trespassing curse/stigma, would still be unable to enter your home without your express permission. Its about domain, not so much ownership.