Tesla Autopilot is under fire. Again. This time, rather than a few journalists relaying stories from behind a keyboard (hi), things are a lot more serious. The National Highway Traffic Safety Administration (NHTSA) opened a formal investigation into Tesla's proprietary adaptive cruise control software. Unfortunately, this comes after a series of accidents, some of them fatal. We've heard about these stories before, and admittedly, I've covered several of them. But now, Tesla is in real hot water with the Feds.