Chemist Facundo Fernandez of the Georgia Institute of Technology tested morning-after pills collected from 15 different pharmacies in Lima, Peru. Rob Felt/Georgia Tech hide caption

itoggle caption Rob Felt/Georgia Tech

Shoppers buy smuggled counterfeit drugs at the Adjame market in Abidjan, Ivory Coast, in 2007. Issouf Sanogo/AFP/Getty Images hide caption

itoggle caption Issouf Sanogo/AFP/Getty Images

In rural areas of Myanmar, villagers can buy inexpensive packets of drugs, called Ya Chut, when they have malaria. But these local remedies often don't contain adequate amounts of malaria medicines. Ben de la Cruz/NPR hide caption

itoggle caption Ben de la Cruz/NPR