The difference is you can choose when you wear your ID Badge / ring outside of work hours. The potential to have your location outside of work hours (by having

The difference is you can choose when you wear your ID Badge / ring outside of work hours. The potential to have your location outside of work hours (by having readers secreted in places) is an invasion of privacy. Most likely requires cooperation from the 'other venues' and I'm not sure what their value proposition would be, but my lack of imagination doesn't rule out the possibility of nefarious uses.