In 1974 Janssen scientists synthesized a molecule with an entirely new level of efficiency in reaching the brain. They called it carfentanil. Carfentanil was ten thousand times more potent than morphine. It had no valid use on humans, they believed, but they saw that it sedated elephants, rhinoceroses, and other large mammals. In the United States, later, carfentanil was made legal only for zoo veterinarians to possess. (UK scientists concluded that in 2002 the Russian government used carfentanil to attack Chechen rebels who had taken over a Moscow theater, dispersing it through the building’s
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