The U.S. National Highway Traffic Safety Administration (NHTSA) sent a cease and desist letter to Tesla last year, Bloomberg reported today on the 1-year anniversary of the "funding secured" tweet, for "not complying with the agency's guidelines in its Model 3 safety assertions". The NHTSA also reportedly subpoenaed Tesla for information on several crashes. The documents were revealed through a FOIA request by non-profit advocacy group PlainSite. 

NHTSA lawyers reportedly weren't happy with a blog post that Tesla made in October, claiming that the Model 3 had "achieved the lowest probability of injury of any vehicle the agency ever tested." The NHTSA said that the claims were inconsistent with its advertising guidelines regarding crash ratings and that it would ask the FTC to investigate if the claims were unfair or deceptive.