Elon Musk has officially left the Trump White House, capping a turbulent effort to slash the federal government by the world's richest man.

As Elon Musk departs Washington, his mood resembles his Cybertruck: ugly and adolescent.

Mr. Musk’s drug consumption went well beyond occasional use. He told people he was taking so much ketamine, a powerful anesthetic, that it was affecting his bladder, a known effect of chronic use.