According to Tesla, the four former employees violated the terms of their contracts by forwarding documents and other information from work email addresses to personal accounts. The files included inventory documents, company schematics and other proprietary pieces of information. Tesla says it caught on to the alleged scheme when one of the former employees now at Zoox mistakenly sent an email to another former Tesla employee's old Tesla email account. The email had an attached image of an internal Tesla document, unchanged from the original but emblazoned with a Zoox logo.

Zoox, a California-based company, has staffed up with a considerable number of Tesla expats. According to Business Insider, more than 100 former Tesla employees now work at the company. It's not uncommon for workers in the field to jump ship to competitors and things can often get ugly in the process. A similar situation occurred when an engineer left Google-owned autonomous car company Waymo to join Uber and allegedly took more than 14,000 company files with him. The case was settled without any party admitting guilt.