About 1 in 5 pork products you buy in the U.S. have tiny traces of a drug called ractopamine, which farmers use to make pigs leaner — but it’s not harmful at these levels, and it’s legal.

There's a simple test using a gel strip that can spot tiny amounts of two banned animal drugs—salbutamol and ractopamine—in pork, right at the farm or market, and you can see the result with your eyes alone.

Scientists have created a special jelly-like test that can check pork for two different illegal growth drugs at the same time—no need for two separate tests.

Scientists have created a special test using gel that can spot tiny, harmful drug residues in pork—like salbutamol and ractopamine—at levels way too small for the naked eye to see, making it much more accurate than just looking at the meat.