Poachers should be aware that Obama has been working to stop the smuggling of poached ivory in elephant tusks. If the ivory comes from an animal before 1990 it's legal to trade; therefore, people lie and make the ivory look older. Fortunately, Dr. Uno is using atmospheric testing of nuclear weapons to find out exactly how old a piece of ivory is to prevent the smugglers from trading. In his method, he tests the carbon-14 in the ivory to find out exactly how old the ivory is.  Between 1952 and 1962 there was a lot of carbon 14 in the air, and each year it drops a significant amount. Dr. Uno can then tell if the amount of carbon in the air matches the level of carbon in the elephant's tusks. He measured the specimen's level of carbon 14 using the accelerator mass spectrometry. The carbon he tested matched the bomb curve, therefore his  method worked and he's now able to catch the lying traders that make their ivory look older. Unfortunately, the method is expensive and countries like Africa can't afford it, even though elephant numbers have dramatically decreased.