Roe v. Wade, 410 U.S. 113 (1973), and Planned Parenthood of Southeastern Pennsylvania v. Casey, 505 U.S. 833 (1992), recognized a federal constitutional right to abortion before fetal viability, i.e., the "capability of meaningful life outside the mother's womb." See Roe, 410 U.S. at 163; Casey, 505 U.S. at 846. Read together, Roe and Casey held that states may regulate (but not ban) abortions before viability to protect maternal or fetal health so long as such regulations do not impose an "undue burden" on a woman seeking an abortion of a nonviable fetus. See Casey, 505 U.S. at 877-78 (plurality opinion).