During our trip in February DD had her pin lanyard in her carryon backpack. Had I remembered prior to checking in I probably would have put them in the larger suitcase to keep from having issues with security.
As it turned out, her backpack went thru security with not issues about the pins or anything else. Not sure if this is the norm, or we were just 'lucky'; the thought of having had the pins conviscated (sp?) is not a pretty one.