"who said using the gadgets is virtually the same thing as following a car along a road."
The only difference being that if they actually want to follow a car on the road they have to use a vehicle and manpower to do it.
Now instead they can have someone attach a device that costs $60 to as many cars as they want and sit someone down at a pc to watch them.
This is very, very bad.
If you haven't done anything wrong, you don't have anything to fear
>/sarcasm
If a police car is on a public highway, I can follow it. Therefore, I can secretly place a GPS transceiver on the police car, and track its movements wherever I want. Do I understand this ruling correctly?
How about the car of that cute girl down the street?