As it pursues the goal of fully autonomous driving, Tesla has bet entirely on cameras and artificial intelligence, shunning other commonly used tools such as laser detection. Tesla Chief Executive Elon Musk has touted a system built around eight "surround" cameras that feed data into the auto's "deep neural network," according to Tesla's website. But as with so many other things involving Tesla, there is controversy. At the giant Consumer Electronic Show (CES) in Las Vegas, Luminar Technologies has set up a demonstration of two autos moving at about 30 miles per-hour towards the silhouette of a child. A car utilizing Luminar's lidar, a laser-based system, stops in advance of trouble, while its rival, a Tesla, careens into the mannequin.