(Reuters) – Arizona Republican Governor Doug Ducey signed a law on Monday that requires doctors to tell women that drug-induced abortions can be reversed and that blocks the purchase of insurance on the Obamacare health exchange that includes abortion coverage.

The requirement that patients be told that the effects of abortion pills may be undone by using high doses of a hormone was the most hotly contested provision during legislative debate.

Supporters said there was ample evidence the reversal was possible if acted upon quickly, although they provided no peer-reviewed studies in support of their position.