Read their statement in the article
> "Tesla enters into contractual agreements with its general contractors, which allow them to select the resources they need for the job while also requiring them to hire and _pay_ their workers appropriately."
Do you think they did a good job in enforcing their own stated requirement?
Any client who permits people to work in their premises providing them with badges and security passes does minimal background checks. Now tell me what minimal background check would not have found their Visa Status and hence Visa fraud on the basis of B1 Visa person doing hands on job?
Do you still think Tesla was ignorant or closed their eyes purposefully?