Again, the fact that this is available, perhaps to someone that never drives
in their home state so doesn't have a placard.  Perhaps to someone who has
plates and isn't bringing their car.  Perhaps to someone who has a placard
but lost or forgot to pack the darn thing, doean't mean it is required of
someone who has a valid placard from their home state with them.

No where do I see anything that says every non-resident has to get one while
they are here.

Jo