Comment 6 for bug 445326

Or hang on, this is just for what the killswitch _can_ control. I don't actually have any adapter:

$ udevadm trigger --verbose --dry-run --subsystem-match=bluetooth
$

If I plug in my usb bluetooth dongle, your command adds a new one:

Device
  Name: hci0
  Type: bluetooth

and now udev also knows about it:

$ udevadm trigger --verbose --dry-run --subsystem-match=bluetooth
/sys/devices/pci0000:00/0000:00:1d.7/usb1/1-8/1-8.2/1-8.2:1.0/bluetooth/hci0
$