Fighting the fake drug menace is like playing whack-a-mole. It is technically illegal for individuals to order drugs online from other countries. And yet no sooner does the F.D.A. shut down one dubious online pharmacy than another pops up. According to the National Association of Boards of Pharmacy, only 3 percent of the 9,600 online pharmacies it has reviewed complied with industry standards. Many were based overseas, so their sales to Americans were illegal; others did not require doctors' prescriptions. And some were very likely peddling dangerous counterfeit drugs.