I noticed that If I put the key on a table near the car in the garage, I can still able to get in and put the gear to "D" and then drive away without any warning. Eventually, the car will find key is missing and pop up a warning while I am on the street and I need to drive back to get the key. However, my Toyota can do better than that. When a key is near my Toyota but outside, it will unlock the car, however, it will popup a "key not inside warning" when I try to start the car. i.e. I am not able to drive away with key outside of the car. So, it seems that either the Tesla can't not tell if the key fob is inside or outside or if it does, the software hasn't be programmed to behavior differently. Something can be improved by firmware in future?