EDM STi (don't mind the stickers):
Notice the taillight.
As for having them here in the U.S., the question is IF you need them:
You can't turn on your fogs by themselves unless you've modded the relay/harness, so IF you have your fogs on, your headlights will be on, and your taillights will be on anyways. Is a dinky little light in the rear going to make a difference while the tails are on for USDM STi/WRXs? I doubt it.
So if it's not used for function, then it's for aesthetics, hence the "CDI factor". In the U.S. for someone without modded fogs at least.