The Los Angeles Police Department and the military have commissioned a prototype for a device which disables a moving vehicle. The system is written up in this BBC article:
According to its inventor, Dr David Giri, at the flick of a switch, the zapper directs a beam of intensely concentrated radio waves at the target car and makes it stall, safely bringing it to a halt.
The system works, says Dr David Giri, because it turns the very technology which has revolutionised motoring over the past decade against the driver.
Computer chips are now used in most cars to control the fuel injection and engine firing systems. By knocking these out the car cannot be driven.
Dr Giri, a physics professor at the University of California in Berkeley set up a company called ProTech to develop the radio wave vehicle-stopping system for the US marine corps and the Los Angeles police department.What will the LA stations do for daytime programing if this gadget catches on?
Engadget links to an NPR interview with the inventor.