However, the process is not yet foolproof and many such false images leave visible signs they are fake. Blurring or flickering around a person's face is a common indicator an image has been doctored, especially when the face changes angles rapidly. Lt Gen Shanahan warns it is increasingly likely society will be influenced by false imagery, as hackers' expertise and the sophistication of AI technology increases. "Within probably 30 minutes you can get online and start developing fairly high fidelity deep fakes," he said. The General also sought to provide reassure that as AI capability developed, the US military would not seek to develop autonomous "killer robots".