The IRS and most states use the "direction and control" rule.
If the person working for you is under your direction and control, they are your employee.
Some of the factors you must take into account are these:
1. Is the worker required to do the work at a location specified by you?
2. Is the worker required to perform the work during hours specified by you?
3. Can the worker sub-contract the work to someone else?
4. If you are claiming that the worker is an independent contractor, does the worker have his own business license?
For example: If you want me to spray paint 500 metal cabinets, and you want me to do the work at your shop during the hours of 8AM to 5PM, Monday through Friday, then I am an employee.
If, on the other hand, you deliver the cabinets to me, and I do the spray-painting in my garage at hours of my own choosing, and return the painted cabinets to you after I am done, then I am probably an independent contractor.
Use common sense here, and don't try to weasel around the law, and you'll know what to do without hiring a lawyer.