Sniffing for laptops with Bluetooth

Link: UK police claim thieves are sniffing for laptops with Bluetooth phones – Engadget Mobile.

We’re mighty skeptical of a recent warning by the Cambridgeshire division that thieves are using their cellphones to locate and steal Bluetooth-enabled laptops from the "boots" of cars.

LIkewise… surely the bluetooth facility in your laptop is switched off whenever you put your laptop on standby anyway?