The use of performance-enhancing drugs has a long history in war, both as a product of state-sanctioned programs and illicit use by participants. Aggression, energy and alertness have always been critical to any warfighter, but artificial means of achieving and maintaining a state of combat readiness have evolved—or devolved, as the case may be—and possibly spread in recent decades: Child soldiers fighting for Sierra Leone’s Revolutionary United Front consumed a mixture of marijuana, cocaine and hallucinogenic drugs, including “brown-brown,” a snorted blend of cocaine and gunpowder. Some ISIS fighters reportedly use a methamphetamine-like psychostimulant in their brutal quest to create a global caliphate; steroids were found at an ISIS training centre in Mosul in 201...