Each year, fake or substandard medications kill more than 300,000 people worldwide. Many of these falsified drugs are dispensed in developing countries, where they can either directly harm users or deprive them of needed treatment. Testing medication to ensure it is genuine can be costly and difficult. And with internet sales of medications on the rise, people everywhere are increasingly at risk. That’s why a team of researchers led by Marya Lieberman developed a simple, inexpensive paper-based device to screen suspicious medications in real time.