Tesla rocked by latest executive shakeup, Musk’s behavior on webcast

Tesla Inc's shares dropped the most in two years on Friday, rocked by the departure of its accounting chief after just a month and mounting investor concerns about Chief Executive Elon Musk's behavior after he smoked marijuana on a live webcast. Investors in the electric carmaker are on edge after a tumultuous August, during which Musk proposed and then abruptly pulled the plug on a go-private deal. Tesla said Chief Accounting Officer Dave Morton resigned because of discomfort wit