This is what they`ve done...

A vaccinated person does not always emit these MAC addresses, visible through the mobile phone’s Bluetooth receiver. This is described in the scientific literature, specifically in the DCCORONA and EECORONA wireless nano communication protocols. As indicated, one of the problems of nano communication networks is the limited energy they have to operate. This means that they are not always on, working, or signalling. It only happens when they receive signals from outside the body or when information is collected that must be transmitted. https://lilianeheldkhawam.files.wordpress.com/2021/12/12-intracorporal_nanonetwork.pdf