In comments provided to the OpenHAN task force, Google stated that the home area network has zero physical security from consumer tampering. Google comments continue that any device in the home can be tampered with at any time.

Short of physical inspection, it may be impossible to determine whether physical tampering of a HAN device has occurred. Once an attacker has physical access to a device and a (basically) infinite amount of time to modify the device, all devices on the network (and the network itself) becomes suspect. Read more »