Jennie Linn McCormack had just finished doing laundry and putting her 2-year-old son to bed when she heard a knock one evening in May 2011. McCormack, a single mother of three living off child support checks, opened the door to find a police officer. He was there to arrest her. The officer explained that McCormack had committed a serious felony under Idaho law—by giving herself an abortion. He proceeded to barrage her with invasive questions about her body and her ex-boyfriend....

After several humiliating hearings, McCormack and her attorney defeated the charge. McCormack actually had given herself an abortion in late 2010, mostly out of desperation: There were no abortion clinics anywhere in southeast Idaho, and an abortion in Salt Lake City, 138 miles away, could cost $2,000. So McCormack procured abortion pills online and took five. She hadn’t realized that her fetus was between 19 and 23 weeks old—and that she was much too far along in her pregnancy to have a safe nonsurgical abortion. McCormack told her friend about the abortion. The friend told her sister—and her sister told the police, who found the fetus wrapped in bags on McCormack’s back porch.

After a judge dismissed the case against her for lack of evidence, McCormack was legally off the hook. But she was also furious: furious that Idaho had intruded so deeply into her private life, furious that its strict abortion laws had driven her to such desperate extremes, furious that other women in her situation might be forced to undergo unsafe abortions at their own hands. So McCormack and her lawyer—who happened to also be a doctor—brought a class action in federal court, seeking to have a slew of Idaho’s draconian anti-abortion laws struck down as unconstitutional.

On May 29, the 9th U.S. Circuit Court of Appeals granted McCormack’s wish. It affirmed a lower court’s invalidation of the self-induced abortion statute, as well as three other laws: one that barred abortions of fetuses at 20 weeks postfertilization, one that required all second-trimester abortions to occur in hospitals, and one that placed onerous burdens on clinics in the form of safety regulations. The litigation may not be over: Idaho can ask a bigger panel of 9th Circuit judges to rehear the case or appeal the ruling to the Supreme Court. Still, as states like Wisconsin move closer to enacting shockingly stringent abortion laws, the decision is a powerful affirmation of constitutional autonomy in an age when that value is in short supply.