A federal appeals court on Friday banned the mailing of the popular prescription abortion drug mifepristone , dealing a major blow to reproductive rights across the United States.     The Fifth Circuit's unanimous ruling temporarily reinstated an in-person dispensing requirement, blocking a 2023 Food and Drug Administration (FDA) policy that allowed the drug to be prescribed via telehealth and delivered by mail.    State attorneys argued that the mailing process subverted state bans on abortion and that it should be prescribed only in person or at clinics.  "The regulation creates an effective way for an out-of-state prescriber to place the drug in the hands of Louisianans in defiance of Louisiana law," wrote Circuit Judge Kyle Duncan, of the New Orleans-based court.…