> Time of flight checks, e.g. that a radio relay isn't being used to get to the keyfob many more meters away in the house using a relay/amplifier. That one's s

> Time of flight checks, e.g. that a radio relay isn't being used to get to the keyfob many more meters away in the house using a relay/amplifier. That one's surprising. What's to stop someone following you into a supermarket after you've parked your Porsche, standing next to you with a relay device transmitting via the cell network, and someone else in the car park with the equivalent receiver/relay?