Over the past three years, the U.S. War on Drugs has brought $400 million in fines to rail shippers on the U.S.-Mexican border. Now, The Associated Press reports, the largest U.S. railroad company Union Pacific is refusing to pay for something it cannot control. Following accusations of negligence from the Justice Department, Union Pacific vice president Bob Grimaila says the railroad cannot be expected to "send unarmed personnel into Mexico to battle Mexican drug cartels that maliciously murder and wage a war against the Mexican military."