Like JenC said, I'm nearby in DC where twin homebirths might be called illegal. I had one here going on two years ago. In DC, CPMs are illegal (or alegal, not sure) and CNMs can't attend twin homebirths. So I guess it could have been called illegal on two grounds.
But I think most places it's illegal for the MW, not the mother. The story I read about with the FL VBAC where the sheriff came to her house happened because she went to a hospital for an IV then went back home and the hospital sent the sheriff.
So, if you're in a HB unfriendly state, just look for a good MW and keep quiet about it! You might have to travel for a good midwife, and you might have to tell a story in the case of transfer. But don't let fuzzy or bad laws stand in the way of a healthy homebirth.