No, the law is that states can decide to not implement DST at all, but they can’t decide to have it permanently. At one point a couple New England states were

No, the law is that states can decide to not implement DST at all, but they can’t decide to have it permanently. At one point a couple New England states were looking at this, but for that reason it would have been implemented by moving to a different time zone: year round AST rather than year round EDT. (Which are both UTC-4.) That said, I think states need federal permission to move time zones, too.