this is much more relevant lately with wearables using ble.

if your usb adapter works with ble you can discovery the wearable which is always discoverable. Then link that device to a person and you are good to go.

if you have android you can use "ramble" to discover the devices.

https://play.google.com/store/apps/details?id=com.contextis.android.BLEScanner

here is an article about ble and wearables

http://www.net-security.org/secworld.php?id=18422