As long as the slave is clothed decently and no lewd acts or violent punishmnents are adminstered in public it would probably be okay. The govt wouldn't interfere in the man's right to have his wife as his slave as long as he respected their laws not to treat her like a slave in public. I'm reminded of the difficulties the U.S. faced in the 1830s to 1850s when southern states citizens wanted to take their slaves north into free states. The same problems occurred then. Some U.S. states did not act to assist southern citizens in returning runaway slaves, yet some did.