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Evolution of the Key Card?
I agree that it must be voluntarily.
Due to the fact that it is an invasive procedure that they cannot easily reverse by themselves, and it is not removeable outside of workung hours, I think it is not ethically correct. And what data is stored on it, what sensors are in it?
Furthermore, can be a an unobstrusive, waterproof armband not enough? And if people still forgetting their band, than one should reconsider who they're hiring. ;-)