I'm assuming that North Carolina (and probably other stated) hand out CITES tags like candy. They give you the tag and then you go catch the animal.
Doesn't work that way in Idaho and other western states. You catch the animal, take it to a F&G office or game warden and have it tagged. At the end of the season, all unused tags are destroyed by the F&G. Thus impossible to carry over any tags.
By carrying over tags (in states where you can), you are messing with the export and harvest data. Say you have a 2016-2017 otter tag and you put it on an otter you catch in January 2019. The F&W statistics show that as a 2018-2019 season caught otter. That's not right.
Do your western CITES tags still have a year associated with them? Or do they change the color every year?
We no longer have any year associated with the tags in Minnesota and they do not change color every year.
FYI...NC charges $2.20 for each CITES tag, and you can order as many as you think you will need and they will ship them to your door.