637.7 California Penal Code cited above is the correct law.
The tracking on smart watches and phones can be turned off with the push of a button, allowing the user to āopt-outā or revoke permission to track at any time. There is no off button on an RFID chip. If they figured out some way to add Bluetooth to MBs that would allow the user to turn off and on tracking, I believe that would be okay.
The section of 637.7 you are speaking of explicitly states the only exception to electronic tracking without consent, which is a company can use GPS to monitor the movement and location of a person that is driving a vehicle owned by the company. But this exception to consent in the law is problematic, because privacy is a defined right under the California Constitution. Most employers obtain written consent from employees to protect themselves from litigation, even if it isnāt required. But while that small section spells out a specific exception involving company owned vehicles, the law goes well beyond GPS on vehicles to anything that is moveable and can be tracked electronically.
Yes, some apps on smart phones and watches track your location and movement, but you can āopt-outā and prevent those apps permissions to do so easily and at any time. You canāt easily āopt-outā of being tracked by an RFID chip, there is no off button.
For anyone interested in learning more about geolocation tracking and privacy, this is and interesting read and does discuss CA law in some places (mostly the new CCPA law):
http://businesslawtoday.org/2019/03/power-place-geolocation-tracking-privacy/