Radio frequency identification tags (RFID) are inserted in people, clothing, and many objects humans use.  Future versions will engage in two-way communications.  This means future chips will be hackable.  Increasingly, employers are asking … and in the future they will insist … on new hires consenting to the implantation of chips in their bodies.  These chips will clear employees to enter into spaces, gain access to machinery, and perform other access control and identification functions.

What are the current implications of this practice?
Has this issue been the subject of litigation?