The rules the parent commenter is referring to are federal, and extraordinarily well-known, because several generations of businesses have tried to come up with ways to skirt them to avoid taxes.
As far as I understand the rules, the "most heavily weighted factor" you cite is in fact not an IRS employee classification factor at all. A contractor can still be classified as an employee even though they bill through an LLC. BigCo's worry about this so much that they will sometimes withhold taxes from LLCs.
As far as I understand the rules, the "most heavily weighted factor" you cite is in fact not an IRS employee classification factor at all. A contractor can still be classified as an employee even though they bill through an LLC. BigCo's worry about this so much that they will sometimes withhold taxes from LLCs.