As California voters decide whether to amend their state constitution to explicitly protect abortion rights, lawmakers still do not agree on whether the amendment would enshrine those rights, which by state law allow abortion up to 24 weeks, or expand them, permitting abortions at any point in pregnancy, for any reason.

During the legislative debate over the amendment, dubbed Proposition 1 on the November ballot, there were several awkward moments after a question from Republicans stumped Democrats — most notably when Assembly member Kevin Kiley (R-Rocklin) posed it point-blank before the final vote in June. “California law generally bars the performance of an abortion past the point of fetal viability,” he said. “Would this constitutional amendment change that?”

The floor went quiet. For a full 30 seconds, no one said anything. Assembly Speaker Anthony Rendon whispered with Democratic colleagues, asked to have the question repeated, and then promised to answer later. He never did.

Viability has long been a controversial concept, plaguing ethicists on both sides of the abortion debate since it was embedded in the Roe v. Wade decision in 1973. The Supreme Court justices wrote that a woman’s right to privacy was protected only up to viability — the point when a fetus is capable of “meaningful life outside the mother’s womb.” The court said that occurs between 24 and 28 weeks after conception.

Since then, many doctors have bemoaned the legal and political bastardization of the medical concept, arguing that viability is much more complex than gestational age alone. But the public has clung to it, and both opponents and supporters of abortion rights have looked favorably on restricting access to the procedure later in pregnancy.

Current California law incorporates the viability limit from Roe, allowing abortion for any reason through most of the second trimester and after that only if the patient’s or fetus’s health is in danger.

But the constitutional amendment outlined in Proposition 1 doesn’t contain the word “viability.” Even among legal scholars, there is no consensus about whether that means the viability standard in place now will remain if Proposition 1 is approved or if time limits on abortion will be eradicated in California.

“It at least opens the door,” said Mary Ziegler, a law professor at the University of California-Davis, with courts likely making the final interpretation of Proposition 1 after the vote, if it’s approved.

Proponents of Proposition 1 have said the intention was only to preserve the status quo. But in various committee hearings, supporters at times seemed confused by the language of their own bill and scrambled to answer definitively when asked whether the amendment would preserve the viability limit or discard it.

But physicians involved in drafting the amendment, like Dr. Pratima Gupta, said no mistake was made: The word viability was left out on purpose.

“Every pregnancy is individual, and it’s a continuum,” said Gupta, an OB-GYN in San Diego. People come into pregnancy with a range of preexisting health conditions, she said, including diabetes, anemia, high blood pressure, and obesity. They may not have much money or access to good medical care, with the latest technology. All these very nuanced factors determine whether a fetus is viable, she said, not some arbitrary number.

“If I see a patient who has broken their bag of water at 23 weeks of pregnancy, that doesn’t mean that it’s viable or not viable,” she said, explaining that the fetus may survive premature delivery at this stage in some cases but not in others.

Doctors who consulted on the amendment were following the lead of the American College of Obstetricians and Gynecologists, the leading advisory group for OB-GYNs, which removed the term viability from its guidance on abortion in May. The term has become so politicized that it barely has any medical meaning anymore, the group said, and deciding whether and when to have an abortion should be left to the patient and doctor.

“In a world where there is no Roe, I think you’re seeing California legislators trying to write into law a kind of blank slate, a better idea of what reproductive autonomy could be that isn’t just Roe Part 2,” Ziegler said.

In recent years, at least three other states — Colorado, New Jersey, and Vermont — and Washington, D.C., have removed gestational age limits from their abortion laws.

Abortion opponents argue that if California follows suit, it will be a free-for-all, with women lining up for abortions when they’re eight months pregnant.

“We already currently have abortion up to 24 weeks. Why do we need to push it beyond that?” said Jonathan Keller, president and CEO of the California Family Council, a religious nonprofit. “Aren’t we able to say that that is a step too far, even for California?”

Research indicates such scenarios are highly unlikely. Abortions at or after 21 weeks represent only 1.2% of all abortions, according to data from the Centers for Disease Control and Prevention. And studies show the reasons women seek abortions at that point vary, from medical complications that threaten the life of the patient or fetus to, increasingly, legal and logistical barriers.

“It may be that they’re delayed because there are lots of restrictions they have to comply with; it may be because they need to travel for an abortion,” said Elizabeth Nash, a policy analyst at the Guttmacher Institute, a research organization that supports abortion rights. “It may be that they can’t get time off of work. Or it was a wanted pregnancy and something happened.”

This story is part of a partnership that includes KQED, NPR and KHN.

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