Image:  “When was your last period?” health-care professionals ask patients during routine gynecological exams. Menstrual tracking can help a person achieve or avoid pregnancy, understand fertility, anticipate premenstrual syndrome, and detect cycle irregularities that serve as early warning signs of health problems. But when that information is logged on a smartphone app, it could be used as evidence of criminal activity in states where abortion is restricted. In the weeks following...


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