If i am understanding you correctly then i think therein lies my problem.
What i was trying to do was NOT block any of my Smartcard readers internally by setting an exception and not having to add those serial numbers to the list.
Perhaps if i tell you exactly what i am wanting to do you may have a suggestion. I want ALL USB Mass Storage devices to be blocked, unless explicitly allowed. I want all other devices (local printers, scanners & Smartcard readers) to always be allowed and just logged. I came into this role and the white list feature through the LEM was not used, instead they imported the notepad document to the UDLP connector and were not auditing or updating it. So it's a bit of a mess. I don't know whose is what and when it was added.
I would like to be utilizing the white-list within the LEM as it's much easier to manage/update and audit. Do you have any suggestions on how I could begin merging them?