"In Roe v. Wade, 410 U. S. 113, and Doe v. Bolton, 410 U. S. 179, the Court recognized that the States have a legitimate and protectible interest in potential human life. 410 U.S. at 410 U. S. 162. But the Court explicitly held that, prior to fetal viability, that interest may not justify any governmental burden on the woman's choice to have an abortion, [Footnote 4/2] nor even any regulation of abortion except in furtherance of the State's interest in the woman's health. In effect, the Court held that a woman's freedom to elect to have an abortion prior to viability has absolute constitutional protection, subject only to valid health regulations. Indeed, in Roe v. Wade the Court held that, even after fetal viability, a State may "regulate, and even proscribe, abortion except where it is necessary, in appropriate medical judgment, for the preservation of the life or health of the mother.""