People are uncomfortable with this because it inverts the roles of the sensor and the sensed. The participant loses control over their decision whether to check

People are uncomfortable with this because it inverts the roles of the sensor and the sensed. The participant loses control over their decision whether to check in or not. It reminds me of Cory Doctorow's "Are You the Scanner or the Barcode?" http://www.make-digital.com/make/vol22?pg=12#pg12 http://www.make-digital.com/make/vol22?pg=12#pg12