CNN —Dueling decisions in two federal district courts last week are likely to set up a showdown at the Supreme Court over the fate of the abortion pill mifepristone. When the Supreme Court upheld the federal Partial-Birth Abortion Ban Act in 2007, dubious scientific arguments became even more central to anti-abortion advocacy. In Gonzales v. Carhart, the court held that in circumstances of scientific uncertainty, legislators would have more latitude to regulate abortion. Implausible scientific claims are now visible on social media, in lawsuits and in congressional hearings. (By taking this position, abortion opponents can still defend bans with no or few exceptions by claiming that abortion is never necessary.)

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