The basis for the whole "issue authority" of these little pieces of paper that now "grant" you your right stands on the believe that because the Sheriff carries a service sidearm that is bought and paid for by the citizens of his county, that somehow he or she is super knowledgeable in everyone's ability to carry one. Cops qualify with them annually, doncha know?
As a friend of mine once pointed out long ago, Sheriffs should be out saving people from trouble, not regulating people's rights.
"SHERIFF!!! COME QUICK!!! JIMMY FELL DOWN IN A WELL!!!"