Planned Parenthood v. Casey: The main argument was about whether a Pennsylvania law that imposed certain restrictions on abortion, such as mandatory counseling, informed consent, and a 24-hour waiting period, violated the constitutional right to abortion established in Roe v. Wade. The court ruled in favor of Planned Parenthood, stating that a woman has a constitutional right to choose to have an abortion. The decision introduced the “undue burden” standard, which clarified that state regulations could not place a substantial obstacle in the path of a woman seeking an abortion.