The woman accusing Brett Kavanaugh of a drunken assault when both were teenagers has now come forward publicly, and on Monday it caused Republicans to delay a confirmation vote and schedule another public hearing. Yet there is no way to confirm her story after 36 years, and to let it stop Mr. Kavanaugh’s confirmation would ratify what has all the earmarks of a calculated political ambush.

This is not to say Christine Blasey Ford isn’t sincere in what she remembers. In an interview published in the Washington Post on Sunday, Ms. Ford offered a few more details of the story she told anonymously starting in July. She says she was 15 when Mr. Kavanaugh, who would have been 17, and a male friend pushed her into a bedroom at a drinking party, held her down, and pawed her until the male friend jumped on them both and she escaped to a bathroom until the two boys left the room.

Mr. Kavanaugh denies all this “categorically and unequivocally,” and there is simply no way to prove it. The only witness to the event is Mr. Kavanaugh’s high school male friend, Mark Judge, who also says he recalls no such event. Ms. Ford concedes she told no one about it—not even a high school girl friend or family member—until 2012 when she told the story as part of couples therapy with her husband.

The vagaries of memory are well known, all the more so when they emerge in the cauldron of a therapy session to rescue a marriage. Experts know that human beings can come to believe firmly over the years that something happened when it never did or is based on partial truth. Mistaken identity is also possible.

Keep reading this editorial in the Wall Street Journal.