The team used completely untrained red-eared sliders for their research, and played with their innate obstacle-avoidance behaviour. If they see that something is blocking their path in one direction, they naturally move to avoid it. To control the turtles' movements, researchers attached a black half cylinder to the turtle, a little like the visor of a motorcycle helmet, but opaque and with a cover on the top to block any light from above. This was initially positioned around the turtle's rear end, but was pivoted around using a microcontroller and a servo motor to either the left or the right to partially block the turtles vision on one side. This made the turtle believe there was an obstacle it needed to avoid on that side and so encouraged it to move in the other direction.
Can you imagine this technology in 30 years time? Normal, everyday people being turned into assassins.