The Daily Telegraph once put heat monitors under everyone's desk. There was an outcry among the employees about this, and the explanation from the Telegraph was it was part of their HVAC system, and allowed the air conditioner and heater to smartly determine which parts of the building needed more heating and cooling due to more human activity going on in those parts.

Under the most charitable interpretation of the above, the Telegraph meant what it said, and only ever intended to use the data thus collected to optimize HVAC output to only those areas with enough human activity to warrant it.

But, you see, once they had the data about who was at their desk and who wasn't, it behooves them to act on it.