It's not the size that is the issue. It is the placement. Even a few mm of human tissue will completely obscure the signal. RFID chips need to be put directly under the skin, as close to the surface as possible. These jabs are given in deep muscle tissue. You'd need a transmitter the size and power of an MRI machine to even get a signal to them at that depth, and they couldn't respond back.
It's not the size that is the issue. It is the placement. Even a few mm of human tissue will completely obscure the signal. RFID chips need to be put directly under the skin, as close to the surface as possible. These jabs are given in deep muscle tissue. You'd need a transmitter the size and power of an MRI machine to even get a signal to them at that depth, and they couldn't respond back.