https://www.reuters.com/article/us-tesla-moves/tesla-rocked-by-latest-executive-shakeup-musks-behavior-on-webcast-idUSKCN1LN1MH >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