"That doesn't really rise to the level of specifying how a work product must be produced (one of the main differences between employees and contractors)," Can

"That doesn't really rise to the level of specifying how a work product must be produced (one of the main differences between employees and contractors)," Can you please cite any case law for this proposition? PS there is a ton of caselaw on what it means for a taxi driver to be an employee or not, and this isn't in there :)