My question involves labor and employment law for the state of: New York and U.S.A. in general

Recently I was made aware that a company in Wisconsin has had employees volunteer to implant microchips into their hands in the areas between thumb and forefinger. These chips are said to only contain an RFID device or coding to aid employees in opening certain doors in their facility as well as purchasing items from an on location vending machine. It sounds like something from a bad sci-fi conspiracy theory movie, but this is reality.

Although in this instance the microchips were taken voluntarily by the employees, I was curious to know what legislation exists surrounding the possibility that one day a company might think to mandate the implantation of such devices in their employees. Are there laws in place already that would effectively block such an action by an employer?

Thank you for any insight you may offer.