A former director at Tesla was so concerned about Elon Musk's drug use and unpredictable behaviour that she chose not to stand for reelection to the electric car company's board, according to a new report from The Wall Street Journal.

Axar.az reports that Linda Johnson Rice, who served a two-year term on the company's board ending in 2019, confided in Tesla board members on more than one occasion about her worries related to his substance use, The Journal reported.

Rice also informally asked if the board should investigate Musk's drug use which includes ketamine, LSD, cocaine, and ecstasy, according to people familiar with the matter but her concerns were ignored, per the outlet.