We knew of the use of mobiles to check the authenticity of drugs in Africa, but this is the first we heard of it being used in India. Before buying a Sproxil-verified medication, the consumer scratches off the label to reveal a unique code, then texts it to a free number. Seconds later, a response comes back from Sproxil’s computer servers. If the text message is an approval, the medication is real and the customer buys it. If not, she can report the fake.