As far as I can tell Elon has had security clearance since 2019 because Space X was (and still is) contracted to do work for the DOD. However I don't know what kind of clearance it was at that time.
> The Wall Street Journal reported citing people familiar with the matter that SpaceX lawyers recommended that the company's leadership not pursue a higher security clearance for Musk because he would have been asked about contacts with foreign officials as well as his prior drug use.
Please correct me If I'm wrong.