Tesla Inc. has begun hiring back some of the almost 500 members of its Supercharging team that Chief Executive Officer Elon Musk dismissed late last month.

Elon Musk’s use of illicit drugs such as cocaine, ecstasy, ketamine, and LSD threatens Tesla Inc.'s business, including by apparently influencing his sometimes erratic behavior online, according to a newly unsealed court filing.

The day before Elon Musk fired virtually all of Tesla’s electric-vehicle charging division last month, they had high hopes as charging chief Rebecca Tinucci went to meet with Musk about the network’s future, four former charging-network staffers told Reuters.