"In 1973, the U.S. Supreme Court ruled that the state’s important and legitimate interest in potential life becomes “compelling” at the point of fetal viability. After viability, the state’s interest allows it to regulate and eve n prohibit all abortions, with the exception of those necessary to preserve the life or health of the mother. Viability was signified as the point at which the fetus is “potentially able to live outside the mother’s womb albeit with artificial aid,” and presumably capable of “meaningful life outside the mother’s womb.” The Court indicated that this point, at that time, “is usually placed” at about 7 months or 28 weeks, but may occur earlier (see CRS Issue Brief 95095). The Court further ruled that a state may regulate the abortion procedure in ways that reasonably relate to preserving and protecting maternal health during the gestation period following approximately the end of the first trimester (after 12 weeks of gestation). However, for the period before this point (up to 12 weeks), the abortion decision and its effectuation must be left to the pregnant patient and the medical judgement of the her attending physician."